Etymology
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Words related to *pet-

accipiter (n.)

raptorial bird, 1708, from Latin accipiter, a generic name for birds of prey, especially the common hawk. According to de Vaan, "generally assumed" to be from a Proto-Italic *aku-petri- "having pointed (that is, 'swift') wings" (see acro- + ptero-) and compares Greek okypteros "with swift wings," Sanskrit asu-patvan- "flying swiftly," "all of which are used as epithets to birds of prey." Under this theory the initial acc- is by influence of the verb accipere "to take" (whence also Latin acceptor "falcon;" see accept). Or the sense could be literal, "with pointed wings." The proper plural would be accipitres. Related: Accipitral; accipitrine (1809).

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appetence (n.)

"strong desire, act of seeking or craving that which satisfies the senses," c. 1600, from French appétence "desire," from Latin appetentia "longing after something," abstract noun from appetentem (nominative appetens), present participle of appetere, from ad "to" (see ad-) + petere "to seek, request" (from PIE root *pet- "to rush, to fly"). Related: Appetency.

appetite (n.)

c. 1300, "craving for food," from Anglo-French appetit, Old French apetit "appetite, desire, eagerness" (13c., Modern French appétit), from Latin appetitus "appetite, longing," literally "desire toward," from appetitus, past participle of appetere "to long for, desire; strive for, grasp at," from ad "to" (see ad-) + petere "go to, seek out," from PIE root *pet- "to rush, to fly."

Formerly with of or to, now with for. Of other desires or cravings, from late 14c. As an adjective, "characterized by appetite," OED and Century Dictionary list appetitious (1650s) and appetitual (1610s) as obsolete, but appetitive (1570s) continues.

apterous (adj.)

"wingless," 1775, from a- "not, without" (see a- (3)) + pterous, from Greek pteryx "wing" (from PIE root *pet- "to rush, to fly").

apteryx (n.)

"kiwi," zoological name for the flightless birds of New Zealand, 1813, Modern Latin, from Greek a- "without" (see a- (3)) + pteryx "wing" (from PIE root *pet- "to rush, to fly").

archaeopteryx (n.)

Jurassic fossil animal long considered the oldest known bird (in 21c. new candidates emerged), 1871, from German (1861), coined in Modern Latin by German paleontologist Christian Erich Hermann von Meyer, from archaeo- "ancient, primitive" + Greek pteryx "wing" (from PIE root *pet- "to rush, to fly"). Discovered (first as a single feather) by Andreas Wagner in 1860 or '61 in Bavaria.

asymptote (n.)

"straight line continually approaching but never meeting a curve," 1650s, from Greek asymptotos "not falling together," from a- "not" (see a- (3)) + assimilated form of syn "with" (see syn-) + ptotos "fallen," verbal adjective from piptein "to fall," from PIE root *pet- "to rush; to fly." Related: Asymptosy.

centripetal (adj.)

"tending or moving toward a center," 1709, from Modern Latin, coined 1687 by Sir Isaac Newton (who wrote in Latin), from Latin centri-, alternative combining form of centrum "center" (see center (n.)) + petere "to make for, go to; seek, strive after" (from PIE root *pet- "to rush, to fly"). Centripetal force is Newton's vim ... centripetam.

Coleoptera (n.)

insect order having the wings sheathed by hardened shells, 1763, from Modern Latin, from Greek koleopteros, literally "sheath-wing," used by Aristotle to describe beetles, from koleos "sheath" (from PIE root *kel- (1) "to cover, conceal, save") + pteron "wing" (from PIE root *pet- "to rush, to fly"). Related: Coleopterous; coleopteran; coleopteral.

compete (v.)

1610s, " to enter or be put in rivalry with," from French compéter "be in rivalry with" (14c.), or directly from Late Latin competere "strive in common, strive after something in company with or together," in classical Latin "to meet or come together; agree or coincide; to be qualified," from com "with, together" (see com-) + petere "to strive, seek, fall upon, rush at, attack" (from PIE root *pet- "to rush, to fly").

According to OED, rare 17c., revived from late 18c. in sense "to strive (alongside another) for the attainment of something" and regarded early 19c. in Britain as a Scottish or American word. Market sense is from 1840s (perhaps a back-formation from competition); athletics sense attested by 1857. Intransitive use is by 1974. Related: Competed; competing.