Etymology
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Words related to nude

naked (adj.)

Old English nacod "nude, unclothed, bare; empty," also "not fully clothed" (a sense still used in 18c.),  from Proto-Germanic *nakwadaz (source also of Old Frisian nakad, Middle Dutch naket, Dutch naakt, Old High German nackot, German nackt, Old Norse nökkviðr, Old Swedish nakuþer, Gothic naqaþs "naked"), from PIE root *nogw- "naked" (source also of Sanskrit nagna, Hittite nekumant-, Old Persian *nagna-, Greek gymnos, Latin nudus, Lithuanian nuogas, Old Church Slavonic nagu-, Russian nagoi, Old Irish nocht, Welsh noeth "bare, naked").

Of things, "without the usual or customary covering" (of a sword, etc.), from Old English. Applied to qualities, actions, etc., "mere, pure, open to view, unconcealed," from c. 1200; phrase the naked truth is from early 15c. Phrase naked as a jaybird (1943) was earlier naked as a robin (1879, in a Shropshire context); Middle English had naked as a worm (mid-14c.), naked as a needle (late 14c.). Naked eye "the eye unassisted by any instrument" is from 1660s, an unnecessary term before telescopes and microscopes.

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nudity (n.)

"condition or fact of being naked, a nude or naked state," 1610s, from nude (adj.) + -ity; or else from French nudité "nakedness" (14c.) or directly from Late Latin nuditatem (nominative nuditas) "nakedness, bareness," from Latin nudus "naked, bare" (see naked).

nudie (n.)
"a nude show," 1935, from nude (adj.) -ie
nudification (n.)

"a making naked," by 1838, perhaps from French nudification (by 1833); see nude + -fication.

nudism (n.)

"The cult and practice of going unclothed" [OED], 1929, from French nudisme (see nude + -ism). Nudist "one who practices nudism" appeared at the same time.

Made in Germany, imported to France, is the cult of Nudism, a mulligan stew of vegetarianism, physical culture and pagan worship. ["Time," July 1, 1929]
nudist 

1929, adjective and noun, from French nudiste or formed in English from nude (adj.) + -ist; see nudism.