Etymology
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peal (n.)

mid-14c., pele, "a ringing of a bell" especially as a call to church service; generally considered a shortened form of appeal (n.), with the notion of a bell that "summons" people to church (compare similar evolution in peach (v.)). Middle English pele also had the sense of "an accusation, an appeal" (15c.), and apele for "a ringing of bells" is attested from mid-15c.

Extended sense of "loud ringing of bells" is first recorded 1510s; subsequently it was transferred to other successions of loud sounds (thunder, cannon, mass shouts or laughter). Meaning "set of bells tuned to one another" is by 1789.

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pear (n.)

Middle English pere, from Old English pere, peru "fruit of the pear tree," common West Germanic (Middle Dutch, Middle Low German pere, Old High German pira, bira, Dutch peer), from Vulgar Latin *pera, variant of Latin pira, plural (taken for fem. singular) of pirum "pear," a loan word from an unknown source, perhaps Semitic or a lost Mediterranean language. It likely shares an origin with Greek apion "pear," apios "pear tree." Their cultivation began as much as 3,000 years ago.

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peacenik (n.)

hostile term for a pacifist or opponent of military action, 1962, from peace + -nik. An earlier equivalent was peacemonger (1808).

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peak (n.)

1520s, "pointed top, projecting summit," a variant of pike (n.4) "sharp point." Meaning "top of a mountain, a precipitous mountain with a more or less conical summit" is recorded by 1630s, though pike was used in this sense c. 1400. Figurative sense is 1784. Of beards, 1590s; of hats, 1650s. Meaning "point formed by hair on the forehead" is from 1833. As "the highest point" in any varying quantity, or the time when this occurs, by 1902. 

The Peak, the prominent hill in Derbyshire, England, is older than the word for "mountaintop;" compare Old English Peaclond, for the district, Pecsaetan, for the people who settled there, Peaces ærs for Peak Cavern. In this case it is sometimes said to be a reference to an elf-denizen Peac "Puck."

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pearly (adj.)

mid-15c., perli, "resembling a pearl or mother-of-pearl," from pearl + -y (2). Related: Pearliness. The pearly gates of Heaven (or the New Jerusalem) are attested by 1708, from Revelation xxi.21.

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peaty (adj.)

"resembling or composed of peat," 1765, from peat + -y (2). Related: Peatiness.

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peal (v.)

1630s, "sound loudly, resound" (intransitive), from peal (n.). Transitive sense of "to utter or cause to ring loudly and sonorously" is by 1714. Related: Pealed; pealing.

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peaceful (adj.)

early 14c., pesful, peesfull, paisful, "inclined to peace, friendly, pacific;" mid-14c. as "tranquil, calm, full of peace;" from peace + -ful. In reference to nonviolent methods of effecting social change, it is attested from 1876. Related: Peacefully; peacefulness. Peaceful coexistence (1920) originally was in regard to Soviet policy toward the capitalist West.

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peacock (n.)

c. 1300, poucock, po-cok, "bird of the genus Pavo," especially an adult male, from Middle English po "peacock" + coc (see cock (n.)). Po is from Old English pawa "peafowl" (cock or hen), from Latin pavo (genitive pavonis), which, with Greek taos is said to be ultimately from Tamil tokei, but perhaps it is imitative: Latin represented the peacock's sound as paupulo. The Latin word also is the source of Old High German pfawo, German Pfau, Dutch pauw, Old Church Slavonic pavu. Middle English also had poun "peacock" from Old French paon.

Noted for its strutting gait, imposing magnificence, and the ostentatious displays of its beautiful tail, the peacock in his pride is one with his tail fully displayed. Used as the type of a vainglorious person from mid-14c. (proud as a po). Its flesh superstitiously was believed to be incorruptible (even St. Augustine credits this). "When he sees his feet, he screams wildly, thinking that they are not in keeping with the rest of his body" [Epiphanus]. As a southern constellation from 1674.

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pearl (n.)

"nacreous mass formed in the shell of a bivalve mollusk as a result of irritation caused by some foreign body," early 14c., perle (mid-13c. as a surname), from Old French perle (13c.) and directly from Medieval Latin perla (mid-13c.), which is of unknown origin. Perhaps from Vulgar Latin *pernula, diminutive of Latin perna, which in Sicily meant "pearl," earlier "sea-mussel," literally "ham, haunch, gammon," so called for the shape of the mollusk shells.

Other theories connect it with the root of pear, also somehow based on shape, or Latin pilula "globule," with dissimilation. The usual Latin word for "pearl" was margarita (see margarite).

Used from 14c. of anything valuable or of the finest kind; from mid-15c. of something small, round, and glistening white. For pearls before swine, see swine. Pearl Harbor translates Hawaiian Wai Momi, literally "pearl waters," so named for the pearl oysters found there; transferred sense of "effective sudden attack" is attested from 1942 (in reference to Dec. 7, 1941).

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