Etymology
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milk of magnesia (n.)

1880, proprietary name for white suspension of magnesium hydroxide in water, taken as an antacid, invented by U.S. chemist Charles Henry Phillips. Herbal or culinary preparations more or less resembling milk had been similarly named (for example milk of almond) since late 14c.

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cafe au lait (n.)
1763, French café au lait, literally "coffee with milk," from lait "milk" (12c.), from Latin lactis, genitive of lac "milk" (see lacto-). As opposed to café noir "black coffee."
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white meat (n.)
"meat of poultry, pigs, etc.," as opposed to red meat, 1752, from white (adj.) + meat (n.). Earlier it meant "foods prepared from milk" (early 15c.). African-American vernacular sense of "white women as sex partners" is from 1920s.
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