frigid (adj.)youdaoicibaDictYouDict[frigid 词源字典]
1620s, "intensely cold," from Latin frigidus "cold, chill, cool," figuratively "indifferent," also "flat, dull, trivial," from stem of frigere "be cold;" related to noun frigus "cold, coldness, frost," from Proto-Italic *srigos-, from PIE root *srig- "cold" (cognates: Greek rhigos "cold, frost"). The meaning "wanting in sexual heat" is attested from 1650s, originally of males. Related: Frigidly; frigidness.[frigid etymology, frigid origin, 英语词源]
mulatto (n.)youdaoicibaDictYouDict
1590s, "offspring of a European and a black African," from Spanish or Portuguese mulato "of mixed breed," literally "young mule," from mulo "mule," from Latin mulus (fem. mula) "mule" (see mule (n.1)); possibly in reference to hybrid origin of mules. As an adjective from 1670s. Fem. mulatta is attested from 1620s; mulattress from 1805.
American culture, even in its most rigidly segregated precincts, is patently and irrevocably composite. It is, regardless of all the hysterical protestations of those who would have it otherwise, incontestibly mulatto. Indeed, for all their traditional antagonisms and obvious differences, the so-called black and so-called white people of the United States resemble nobody else in the world so much as they resemble each other. [Albert Murray, "The Omni-Americans: Black Experience & American Culture," 1970]
Old English had sunderboren "born of disparate parents."
rigid (adj.)youdaoicibaDictYouDict
early 15c., from Latin rigidus "hard, stiff, rough, severe," from rigere "be stiff," from PIE *reig- "stretch (tight), bind tightly, make fast" (cognates: Old Irish riag "torture," Middle High German ric "band, string"). Related: Rigidly.