also cumquat, 1690s, from Chinese (Cantonese) kamkwat, from kam "golden" + kwat "orange." Said in OED to be a Cantonese dialectal form of Chinese kin-ku.
"a split, crack," 1530s, with unetymological -k + Middle English chine (and replacing this word) "fissure, narrow valley," from Old English cinu, cine "fissure," which is related to cinan "to crack, split, gape," from Proto-Germanic *kino-(source also of Old Saxon and Old High German kinan, Gothic uskeinan, German keimen "to germinate;" Middle Dutch kene, Old Saxon kin, German Keim "germ"). The connection being in the notion of bursting open.
early 15c. (late 12c. as a surname), "a mother or father; a forebear, ancestor," from Old French parent "father, parent, relative, kin" (11c.) and directly from Latin parentem (nominative parens) "father or mother, ancestor," noun use of present participle of parire "bring forth, give birth to, produce," from PIE root *pere- (1) "to produce, bring forth." Began to replace native elder after c. 1500.
Proto-Indo-European root meaning "woman."
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit janis "a woman," gná "wife of a god, a goddess;" Avestan jainish "wife;" Armenian kin "woman;" Greek gynē "a woman, a wife;" Old Church Slavonic zena, Old Prussian genna "woman;" Gaelic bean "woman;" Old English cwen "queen, female ruler of a state, woman, wife;" Gothic qino "a woman, wife, qéns "queen."
Spelling was re-Latinized in early Modern English. Used figuratively in English since c. 1600 of structural relationships in chemistry, philology, geometry, etc. Meaning "natural liking or attraction, a relationship as close as family between persons not related by blood" is from 1610s.
The alliterative phrase kith and kin (late 14c.) originally meant "country and kinsfolk" and is almost the word's only survival in Modern English. Some cognates have evolved different senses, such as Dutch kunde "skill, competence," German Kunde "knowledge, news, tidings."