Etymology
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rheology (n.)

"study of the deformation of the flow of matter," 1929, from French rhéologie; see rheo- "current of a stream" + -logy "study of." Related: Rheologist; rheological.

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matterless (adj.)
late 14c., "insubstantial, immaterial, without physical substance," from matter (n.) + -less. From 1610s as "devoid of sense or meaning."
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re 

"with reference to," used from c. 1700 in legalese, from Latin (in) re "in the matter of," from ablative of res "property, goods; matter, thing, affair," from Proto-Italic *re-, from PIE *reh-i- "wealth, goods" (source also of Sanskrit rayi- "property, goods," Avestan raii-i- "wealth"). Its non-legalese use is execrated by Fowler in three different sections of "Modern English Usage."

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pertinency (n.)

"quality of being relevant to the matter in hand," 1590s, from stem of Latin pertinens "pertaining," present participle of perinere (see pertain) + -cy.

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stain (n.)
1560s, "act of staining," from stain (v.). Meaning "a stain mark, discoloration produced by foreign matter" is from 1580s. Meaning "dye used in staining" is from 1758.
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xantho- 

before vowels xanth-, word-forming element meaning "yellow," from Greek xanthos "yellow" of various shades; used especially of hair and horses, of unknown origin. Used in scientific words; such as xanthein (1857) "soluble yellow coloring matter in flowers," xanthophyll (1838) "yellow coloring matter in autumn leaves." Also Huxley's Xanthochroi (1867) "blond, light-skinned races of Europe" (with ōkhros "pale").

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uncorrupted (adj.)
c. 1400, of organic matter, "not putrefied," from un- (1) "not" + past participle of corrupt (v.). From 1560s of persons, "not influenced by bribes."
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intellectualize (v.)
1819 (Coleridge), "infuse with intellectual quality," from intellectual + -ize. From 1827 as "exercise the mind, reason upon a matter of intellect." Related: Intellectualized; intellectualizing.
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wind-up (n.)
1570s, "conclusion or final adjustment and settlement of some matter," from verbal phrase wind up (see wind (v.1)). Baseball pitching sense attested from 1906.
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letter-press (adj.)
in reference to matter printed from relief surfaces, 1840, from letter (n.1) "a type character" + press (n.). Earlier "text," as opposed to copper-plate illustration (1771).
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