polysemy (n.) Look up polysemy at Dictionary.com
1900, from French polysémie (1897), from Medieval Latin polysemus, from Greek polysemos "of many senses," from poly- "many" (from PIE root *pele- (1) "to fill") + sema "sign" (see semantic). Related: Polysemic.
polystyrene (n.) Look up polystyrene at Dictionary.com
1922, so called because it is a polymer of styrene.
polysyllabic (adj.) Look up polysyllabic at Dictionary.com
1650s (implied in polysyllabical), from Medieval Latin polysyllabicus, from Greek polysyllabikos; see poly- "much, many" + syllabic.
polysyllable (n.) Look up polysyllable at Dictionary.com
1560s; see poly- + syllable. As a rule, a word of more than three syllables.
polysynthesis (n.) Look up polysynthesis at Dictionary.com
1837, from poly- + synthesis.
polytechnic (adj.) Look up polytechnic at Dictionary.com
1805, "pertaining to instruction in many (technical) subjects," from French École Polytechnique, engineering school founded 1794 (as École des Travaux publics) in Paris; from Greek polytekhnos "skilled in many arts," from polys "many" (from PIE root *pele- (1) "to fill") + tekhne "art" (see techno-). As a noun (short for polytechnic institution) from 1836.
polytheism (n.) Look up polytheism at Dictionary.com
1610s, from French polythéisme (16c.), formed from Greek polytheia "polytheism," polytheos "of many gods," from polys "many" (from PIE root *pele- (1) "to fill") + theos "god" (from PIE root *dhes-, forming words for religious concepts).
polytheist (n.) Look up polytheist at Dictionary.com
1610s; see polytheism + -ist.
polyunsaturated (adj.) Look up polyunsaturated at Dictionary.com
1921, from poly- + unsaturated.
polyurethane (n.) Look up polyurethane at Dictionary.com
1944, from polymer + urethane.
polyvalent (adj.) Look up polyvalent at Dictionary.com
1881, from poly- + -valent (see valence in the chemistry sense). Coined by German chemist Emil Erlenmeyer (1825-1909), who also designed the flask that bears his name.
polyvinyl (n.) Look up polyvinyl at Dictionary.com
1930, polymer of vinyl chloride. In chemistry, vinyl was used from 1863 as the name of a univalent radical derived from ethylene, from Latin vinum "wine" (see wine (n.)), because ethyl alcohol is the ordinary alcohol present in wine.
pom-pom (n.) Look up pom-pom at Dictionary.com
"Maxim automatic gun," 1899, of imitative origin, soldiers' slang from the Boer War. For the ornamental tuft, see pompom.
pomace (n.) Look up pomace at Dictionary.com
1570s, "crushed pulp of apples," from Old French pomaz, plural of pome "cider; apple," from Latin pomum "fruit; apple" (see Pomona).
pomaceous (adj.) Look up pomaceous at Dictionary.com
1706, from Vulgar Latin *poma "apple," originally plural of Latin pomus "fruit," later "apple" (see Pomona) + -aceous.
pomade (n.) Look up pomade at Dictionary.com
1560s, from Middle French pommade "an ointment" (16c.), from Italian pomata, from pomo "apple," from Latin pomum "fruit; apple" (see Pomona). So called because the original ointment recipe contained mashed apples.
pome (n.) Look up pome at Dictionary.com
late 14c., of types of apples or apple-shaped objects, from Old French pome "apple" (12c., Modern French pomme), from Late Latin or Vulgar Latin *poma "apple," originally plural of Latin pomus "fruit," later "apple" (see Pomona).
pomegranate (n.) Look up pomegranate at Dictionary.com
c. 1300, poumgarnet (a metathesized form), from Old French pome grenate (Modern French grenade) and directly from Medieval Latin pomum granatum, literally "apple with many seeds," from pome "apple; fruit" (see Pomona) + grenate "having grains," from Latin granata, fem. of granatus, from granum "grain" (from PIE root *gre-no- "grain"). The classical Latin name was malum granatum "seeded apple." Italian form is granata, Spanish is granada. The -gra- spelling restored in English early 15c.
pomelo (n.) Look up pomelo at Dictionary.com
1858, of uncertain origin; apparently related to Latin pomum "fruit; apple" (see Pomona).
Pomerania (n.) Look up Pomerania at Dictionary.com
region and former province of Prussia on the Baltic coast of modern Poland (German Pommern, Polish Pomorze), Medieval Latin, from Pomerani, name of a Slavic tribe there, from Polish po morze "by the sea."
Pomeranian (n.) Look up Pomeranian at Dictionary.com
type of dog, 1760, from Pomerania, former province of Prussia on the south coast of the Baltic Sea.
pommel (n.) Look up pommel at Dictionary.com
mid-13c., "ornamental knob;" c. 1300, "knob at the end of a sword hilt," from Old French pomel (12c., Modern French pommeau), "rounded knob," diminutive of pom "hilt of a sword," from Late Latin pomellum, diminutive of Latin pomum "apple" (see Pomona), the connecting notion being "roundness." Sense of "front peak of a saddle" first recorded mid-15c. In Middle English poetry it also sometimes meant a woman's breast. The gymnast's pommel horse is attested from 1908.
pommes frites (n.) Look up pommes frites at Dictionary.com
"fried potatoes," 1872, French, from pomme "potato" (see pome).
Pomona (n.) Look up Pomona at Dictionary.com
Roman goddess of fruit, from Latin pomum "apple; fruit," of uncertain origin. "Possibly from *po-emo- 'taken off, picked'; *po-omo- or *pe-omo- are also conceivable" [de Vaan]. Or perhaps borrowed from a lost Mediterranean language.
pomp (n.) Look up pomp at Dictionary.com
c. 1300, from Old French pompe "pomp, magnificence" (13c.) and directly from Latin pompa "procession, pomp," from Greek pompe "solemn procession, display," literally "a sending," from pempein "to send." In Church Latin, used in deprecatory sense for "worldly display, vain show."
pompadour (n.) Look up pompadour at Dictionary.com
1887 as a men's hairstyle; 1899 as a woman's style with the hair swept up over the forehead, in recognition of Jeanne-Antionette Poisson, Marquise de Pompadour (1721-1764), mistress of Louis XV from 1745-50, who wore her hair in an upswept style. Used in her lifetime in reference to various fashions, accessories, colors, furniture, etc. The estate of Pompadour is in the Limousin region.
pompano (n.) Look up pompano at Dictionary.com
ocean fish, 1778, from American Spanish pampano, a name given to various types of fish, from Spanish, originally "vine, tendril," from Latin pampinus "tendril or leaf of a vine."
Pompeii Look up Pompeii at Dictionary.com
Roman town buried by volcanic eruption 79 C.E., excavated beginning in 1755; the name is from Oscan pompe "five" (from PIE root *penkwe- "five"), in reference to its five districts. Related: Pompeian.
pompier (n.) Look up pompier at Dictionary.com
"fireman's scaling ladder," French, literally "fireman," from pompe "pump" (see pump (n.)).
pompom (n.) Look up pompom at Dictionary.com
"ornamental round tuft" (originally on a hat, etc.), 1748, alteration of pompon "ornamental tuft; tuft-like flower head," from French pompon (1725), of unknown origin; perhaps related to Old French pompe "pomp."
pomposity (n.) Look up pomposity at Dictionary.com
early 15c., "pomp, solemnity," from Medieval Latin pompositas, from Late Latin pomposus "stately, pompous" (see pompous). The sense of "ostentatious display" is from 1610s; earlier in French pomposité.
pompous (adj.) Look up pompous at Dictionary.com
late 14c., "characterized by exaggerated self-importance," from Old French pompos (14c., Modern French pompeux) and directly from Late Latin pomposus "stately, pompous," from Latin pompa "pomp" (see pomp). More literal (but less common) meaning "characterized by pomp" is attested from early 15c. Related: Pompously.
pon (prep.) Look up pon at Dictionary.com
also 'pon, 1550s, shortened form of upon.
ponce (n.) Look up ponce at Dictionary.com
slang term, chiefly British, 1872, originally "a pimp, a man supported by women" (pouncey in same sense is attested from 1861), of unknown origin, perhaps from French pensionnaire "boarder, lodger, person living without working." Meaning "male homosexual" first attested 1932 in Auden [OED]. Also as a verb. Related: Poncey.
poncho (n.) Look up poncho at Dictionary.com
type of blanket-like South American cloak, 1717, from American Spanish poncho, from Araucanian (Chile) pontho "woolen fabric," perhaps influenced by Spanish poncho (adj.), variant of pocho "discolored, faded."
pond (n.) Look up pond at Dictionary.com
c. 1300 (mid-13c. in compounds), "artificially banked body of water," variant of pound "enclosed place" (see pound (n.2)). Applied locally to natural pools and small lakes from late 15c. Jocular reference to "the Atlantic Ocean" dates from 1640s. Pond scum (Spirogyra) is from 1864 (also called frog-spittle and brook-silk. As figurative for "someone extremely repulsive," from 1984.
ponder (v.) Look up ponder at Dictionary.com
early 14c., "to estimate the worth of, to appraise," from Old French ponderer "to weigh, poise" (14c., Modern French pondérer) and directly from Latin ponderare "ponder, consider, reflect," literally "to weigh," from pondus (genitive ponderis) "weight," from stem of pendere "to hang, cause to hang; weigh" (from PIE root *(s)pen- "to draw, stretch, spin"). Meaning "to weigh a matter mentally" is attested from late 14c. Related: Pondered; pondering; ponderation.
ponderance (n.) Look up ponderance at Dictionary.com
"weight, importance," 1798, from ponder + -ance.
ponderosa (n.) Look up ponderosa at Dictionary.com
type of pine in western U.S., 1878, from scientific name Pinus ponderosa (1836), literally "heavy pine," from Latin ponderosus (see ponderous).
ponderous (adj.) Look up ponderous at Dictionary.com
c. 1400, "thick;" early 15c., "heavy, weighty, clumsy," from Latin ponderosus "of great weight; full of meaning," from pondus (genitive ponderis) "weight," from stem of pendere "to hang, cause to hang; weigh" (from PIE root *(s)pen- "to draw, stretch, spin"). Meaning "tedious" is first recorded 1704. Related: Ponderously; ponderousness.
pone (n.) Look up pone at Dictionary.com
1630s, "American Indian bread," earlier appone, ponap (1610s), from Powhatan (Algonquian) apan "something baked," from apen "she bakes." Later used in Southern U.S. for any type of cornbread.
pong (n.) Look up pong at Dictionary.com
by late 1960s as an abbreviation of ping-pong. The electronic arcade game (with capital P-) was released 1972.
Pongo (n.) Look up Pongo at Dictionary.com
ape genus, 1620s, from Kongo mpongi.
poniard (n.) Look up poniard at Dictionary.com
1580s, from Middle French poinard (early 16c.), from Old French poignal "dagger," literally "anything grasped with the fist," from poing "fist," from Latin pungus "a fist," from suffixed form of PIE root *peuk- "to prick." Probably altered in French by association with poindre "to stab." Compare Latin pugnus "fist," pugio "dagger." As a verb from c. 1600.
pons (n.) Look up pons at Dictionary.com
"bridge," in various Latin expressions, from Latin pons "bridge, connecting gallery, walkway," earlier probably "way, passage," from PIE *pent- "to go, tread" (see find (v.)). Especially pons asinorum "bridge of asses," nickname for the fifth proposition of the first book of Euclid, which beginners and slow wits find difficulty in "getting over": if two sides of a triangle are equal, the angles opposite these sides also are equal. The Latin word is the source of Italian ponte, French pont, Spanish puente.
Pontiac Look up Pontiac at Dictionary.com
Ottawa tribal leader (c. 1720-1769), his name is given in native (Algonquian) form as bwandiag. The city in Michigan, U.S., settled in 1818, was named for him as he is said to be buried nearby. The automobile brand was begun in 1926, discontinued 2010.
Pontic (adj.) Look up Pontic at Dictionary.com
1550s; see Pontus + -ic.
pontifex (n.) Look up pontifex at Dictionary.com
member of the supreme college of priests in ancient Rome, 1570s, from Latin pontifex "high priest, chief of the priests," probably from pont-, stem of pons "bridge" (see pons) + -fex "maker," from facere "to do, make" (from PIE root *dhe- "to set, put"). If so, the word originally meant "bridge-maker," or "path-maker."

Weekley points out that, "bridge-building has always been regarded as a pious work of divine inspiration." Or the term may be metaphoric of bridging the earthly world and the realm of the gods. Other suggestions trace it to Oscan-Umbrian puntis "propitiary offering," or to a lost Etruscan word, in either case altered by folk etymology to resemble the Latin for "bridge-maker." In Old English, pontifex is glossed in the Durham Ritual (Old Northumbrian dialect) as brycgwyrcende "bridge-maker."
pontiff (n.) Look up pontiff at Dictionary.com
c. 1600, "high priest," from French pontif (early 16c.), from Latin pontifex, title of a Roman high priest (see pontifex). Used for "bishop" in Church Latin, but not recorded in that sense in English until 1670s, specifically "the bishop of Rome," the pope. Pontifical, however, is used with this sense from mid-15c.
pontifical (adj.) Look up pontifical at Dictionary.com
early 15c., from Middle French pontifical and directly from Latin pontificalis "of or pertaining to the high priest," from pontifex (see pontifex). Hence pontificalia "trappings of a bishop."