Etymology
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lake (n.2)
"deep red coloring matter," 1610s, from French laque (15c., see lac), from which it was obtained.
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long (n.)
in long and short of it "the sum of the matter in a few words," c. 1500, from long (adj.).
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protoplanet (n.)

"large, diffuse cloud of matter in the orbit of a young star, regarded as the preliminary state of a planet," 1949, from proto- + planet.

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optimistic (adj.)

"of, pertaining to, or characterized by optimism; disposed to take the most hopeful view of a matter," 1845, from optimist + -ic. Related: Optimistical (1809); optimistically.

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toss-up (n.)
"even matter," 1809, from earlier sense of "a flipping of a coin to arrive at a decision" (c. 1700), from verbal phrase, from toss (v.) + up (adv.).
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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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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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