Etymology
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Words related to *g(a)lag-

ablactation (n.)
Origin and meaning of ablactation

"weaning of a child," 1650s, from Latin ablactationem (nominative ablactatio) "weaning," noun of action from past-participle stem of ablactare "to wean," from ab "off, away from" (see ab-) + lactare "to suckle," from lac (genitive lactis) "milk" (from PIE root *g(a)lag- "milk").

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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."
galactic (adj.)
1839, "of the Milky Way, of the bright band of stars around the night sky," from Late Latin galacticus, from galaxias (see galaxy). In modern scientific sense "pertaining to (our) galaxy," from 1849. From 1844 as "of or pertaining to milk."
galaxy (n.)

late 14c., from French galaxie or directly from Late Latin galaxias "the Milky Way" as a feature in the night sky (in classical Latin via lactea or circulus lacteus), from Greek galaxias (adj.), in galaxias kyklos, literally "milky circle," from gala (genitive galaktos) "milk" (from PIE root *g(a)lag- "milk").

The technical astronomical sense in reference to the discrete stellar aggregate including the sun and all visible stars emerged by 1848. Figurative sense of "brilliant assembly of persons" is from 1580s. Milky Way is a translation of Latin via lactea.

See yonder, lo, the Galaxyë Which men clepeth the Milky Wey, For hit is whyt. [Chaucer, "House of Fame"]

Originally ours was the only one known. Astronomers began to speculate by mid-19c. that some of the spiral nebulae they could see in telescopes were actually immense and immensely distant structures the size and shape of the Milky Way. But the matter was not settled in the affirmative until the 1920s.

lactate (v.)
"secrete milk from the breasts," 1889, probably a back-formation from lactation. The Latin verb was lactare. Related: Lactated; lactating.
lactate (n.)
salt of lactic acid, 1790, from French (1789), from stem of lactic + -ate (1).
lactation (n.)

1660s, "process of suckling an infant," from French lactation, from Late Latin lactationem (nominative lactatio) "a suckling," noun of action from past-participle stem of lactare "to suckle," from lac (genitive lactis) "milk" (from PIE root *g(a)lag- "milk"). Meaning "process of secreting milk from the breasts" first recorded 1857. Related: Lactational.

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.
lactescence (n.)
"milky appearance," 1680s, from lactescent "becoming milky" (1660s), from Latin lactescentem (nominative lactescens), present participle of lactescere, inchoative of lactere "to be milky," from lac "milk" (from PIE root *g(a)lag- "milk").
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).