Etymology
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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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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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colostrum (n.)

"the first milk secreted in the breasts after childbirth," 1570s, from Latin colostrum "first milk from an animal," earlier colustra, a word of unknown etymology.

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emulgent 

1570s (adj.), "draining out;" 1610s (n.), in anatomy, "an emulgent vessel," from Latin emulgentem (nominative emulgens), present participle of emulgere "to milk out, drain out, exhaust," from assimilated form of ex "out" (see ex-) + mulgere "to milk" (from PIE root *melg- "to rub off; to milk"). Related: Emulgence.

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