Etymology
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lacteal (adj.)
1650s, "pertaining to milk," earlier "milk-white" (1630s), from Latin lacteus "milky" (from lac "milk," from PIE root *g(a)lag- "milk") + -al (1). Other 17c. attempts at an adjective in English yielded lactary, lactaceous, lacteant, lacteous, lactescent, and, in a specialized sense ("milk-producing"), lactific.
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milky (adj.)
late 14c., "milk-like in color or consistency," from milk (n.) + -y (2). Related: Milkily; milkiness.
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milktoast (n.)

also milk-toast, 1831, "toast softened in milk," from milk (n.) + toast (n.1). Figurative of softness or innocence by 1859.

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milkweed (n.)
1590s, from milk (n.) + weed (n.); used in reference to various plants whose juice resembles milk.
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milkman (n.)

"man who sells milk," especially one who goes door to door, 1580s, from milk (n.) + man (n.).

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lactic (adj.)
1790, "procured from milk," in the chemical name lactic acid, which is so called because it was obtained from sour milk. From French lactique, from Latin lactis, genitive of lac "milk" (from PIE root *g(a)lag- "milk.") + French -ique (see -ic).
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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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emulsify (v.)

"make or form into an emulsion," 1853, from Latin emuls-, past-participle stem of emulgere "to milk out" (from assimilated form of ex "out;" see ex-; + mulgere "to milk," from PIE root *melg- "to rub off; to milk") + -fy. Related: emulsified.

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lactose (n.)
sugar from milk, 1843, from French, coined 1843 by French chemist Jean Baptiste André Dumas (1800-1884) from Latin lac (genitive lactis) "milk" (from PIE root *g(a)lag- "milk") + chemical suffix -ose (2).
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magnesium (n.)

silvery-white metallic element, 1808, coined by English chemist Sir Humphry Davy from the white alkaline earth magnesia (q.v.), in which it was found. With metallic element ending -ium.

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