1881, "a bleaching agent;" 1882, "an act of bleaching;" probably directly from bleach (v.). The Old English noun blæce meant "leprosy;" Late Old English had also blæco "paleness," and Middle English had blech "whitening or bleaching agent," but the modern words seem to be independent late 19c. formations from the verb.
17c., in philosophy, in senses clustered around the notion of "one who believes in the real existence of the external world, independent of all thought about it," from real (adj.) + -ist, and compare French réaliste. Also see realism. Meaning "artist or writer working by the principles of artistic realism" is by 1870.
"plurality of origins," in biology, "generation or origination from several separate and often independent germs; as a doctrine, equivalent to special creation; originally and often specifically in reference to the view that the human race consists of several distinct species, 1858, from poly- + -genesis "birth, origin, creation." Also see polygeny.
musical instruction, used of accompaniments (especially by a single instrument, to a vocal piece), "so important that it cannot be omitted," 1724, from Italian obbligato, literally "obligated," from Latin obligatus, past participle of obligare "to bind" (see oblige). As a noun, "an accompaniment of independent importance," by 1817.
early 13c., "obliquely, with a sidelong glance," of uncertain etymology; from a- (1) "on" + "a word corresponding to Du. schuinte 'slope, slant' of the independent use of which no instances survive ..." [OED]. The Middle English Compendium compares French équinter "cut to a point;" French dialectal (e)squintar "cast a glance, look furtively." Squint is not found in Middle English, and appears to be from this word.