Etymology
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slender (adj.)
c. 1400, earlier sclendre (late 14c.), probably from a French source, often said to be from Old French esclendre "thin, slender," which could be from Old Dutch slinder, but the connections, and even the existence of these words, is doubtful. Related: Slenderly; slenderness.
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waisted (adj.)
c. 1400, "fitted with a (specified type of) waist," from waist.
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slenderize (v.)
1921, from slender + -ize. Related: Slenderized; slenderizing. As a verb, slender "make narrower" is from 1590s.
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ladyfinger (n.)
also lady-finger, used of anything long, slender, and suggestive of grace, 1660s, originally of a type of plant; 1820 in reference to a kind of long, slender confection; see lady + finger (n.).
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sharp-shinned (adj.)

1704, of persons, "having slender shanks," 1813 of hawks; see sharp (adj.) + shin (n.).

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villus (n.)
"long, slender hair," 1704, plural villi, from modern use of Latin villus "tuft of hair, shaggy hair, wool, fleece" (see velvet).
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svelte (adj.)

"slender, lithe," 1817, svelt, from French svelte "slim, slender" (17c.), from Italian svelto "slim, slender," originally "pulled out, lengthened," past participle of svellere "to pluck or root out," from Vulgar Latin *exvellere, from Latin ex- "out" (see ex-) + vellere "to pluck, stretch," from PIE *wel-no-, suffixed form of *uelh- "to strike" (source also of Hittite ualh- "to hit, strike," Greek aliskomai "to be caught").

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gracile (adj.)

"slender, thin," 1620s, from Latin gracilis "slender, thin, fine; plain, simple, meager" (source of French grêle), of unknown origin. Not etymologically connected to grace but often regarded as if it is. Perhaps a dissimilation of a word related to Latin cracens "slender;" if so, perhaps cognate with Sanskrit krsah "thin, weak," Avestan keresa- "lean, meager," Lithuanian karšti "to be very old, to age." Related: Gracility.

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lepto- 
word-forming element used from 19c. and meaning "fine, small, thin, delicate," from Greek leptos "small, slight, slender, delicate" (see lepton).
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