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milkweed (n.)[milkweed 词源字典]: 1590s, from milk (n.) + weed (n.); used in reference to various plants whose juice resembles milk.[milkweed etymology, milkweed origin, 英语词源]
milky (adj.): late 14c., "milk-like in color or consistency," from milk (n.) + -y (2). Related: Milkily; milkiness.
Milky Way (n.): late 14c., loan-translation of Latin via lactea; see galaxy. Also in Middle English Milky Cercle. The ancients speculated on what it was; some guessed it was a vast assemblage of stars (Democrates, Pythagoras, even Ovid). Galileo, after inventing the telescope, reported that the whole of it was resolvable into stars. Old native names for it include Jacob's Ladder, the Way to St. James's, and Watling Street.
mill (n.1): "building fitted to grind grain," Old English mylen "a mill" (10c.), an early Germanic borrowing from Late Latin molina, molinum "mill" (source of French moulin, Spanish molino), originally fem. and neuter of molinus "pertaining to a mill," from Latin mola "mill, millstone," related to molere "to grind," from PIE *mel- (1) "soft," with derivatives referring to ground material and tools for grinding (source also of Greek myle "mill;" see mallet).

Also from Late Latin molina, directly or indirectly, are German Mühle, Old Saxon mulin, Old Norse mylna, Danish mølle, Old Church Slavonic mulinu. Broader sense of "grinding machine" is attested from 1550s. Other types of manufacturing machines driven by wind or water, whether for grinding or not, began to be called mills by early 15c. Sense of "building fitted with industrial machinery" is from c. 1500.
mill (n.2): "one-tenth cent," 1786, an original U.S. currency unit but now used only for tax calculation purposes, shortening of Latin millesimum "one-thousandth," from mille "a thousand" (see million). Formed on the analogy of cent, which is short for Latin centesimus "one hundredth" (of a dollar).
mill (v.2): "to keep moving round and round in a mass," 1874 (implied in milling), originally of cattle, from mill (n.1) on resemblance to the action of a mill wheel. Related: Milled.
mill (v.1): "to grind," 1550s, from mill (n.1). Related: milled; milling.
mill-race (n.): late 15c., from mill (n.1) + race (n.1) in the "current" sense.
mill-wheel (n.): Old English mylnn-hweol; see mill (n.1) + wheel (n.).
millage (n.): 1871, from mill (n.2) + -age.
millenarian (n.): 1550s, "one who believes in the coming of the (Christian) millennium," from Latin millenarius (see millennium) + -ian. As an adjective, "pertaining to the millennium," from 1630s. Related: Millennarianism.
millenary (adj.): "consisting of a thousand," 1570s, from Latin millenarius (see millennium).
millennia (n.): plural of millennium.
millennial (adj.): 1660s, "pertaining to the millennium," from stem of millennium + -al (1). Meaning "pertaining to a period of 1,000 years" is from 1807. As a noun from 1896, originally "thousandth anniversary." From 1992 as a generational name for those born in the mid-1980s and thus coming of age around the year 2000.
millennialism (n.): 1906, from millennial + -ism.
millennium (n.): 1630s, from Modern Latin millennium, from Latin mille "thousand" (see million) + annus "year" (see annual); formed on analogy of biennium, triennium, etc. For vowel change, see biennial. First in English in sense of "1,000-year period of Christ's anticipated rule on Earth" (Rev. xx:1-5). Sense of "any 1,000-year period" first recorded 1711. Meaning "the year 2000" attested from 1970.
miller (n.): mid-14c. (attested as a surname by early 14c.), agent noun from mill (v.1). The Old English word was mylnweard, literally "mill-keeper" (preserved in surname Millward, attested from late 13c.).
millet (n.): cereal grain, c. 1400, from Middle French millet, diminutive of mil "millet," from Latin milium "millet" (see mallet). Cognate with Greek meline, Lithuanian malnus (plural) "millet."
milli-: word-forming element meaning "thousandth part of a metric unit," from comb. form of Latin mille "thousand" (see million).
milliard (n.): "one thousand million," 1793, from French milliard (16c.), from million (see million) with change of suffix. A word made necessary by the double meaning of billion.