Etymology
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-stan 
place-name element in Afghanistan, Pakistan, etc., from Persian -stan "country," from Indo-Iranian *stanam "place," literally "where one stands," from PIE *sta-no-, suffixed form of root *sta- "to stand, make or be firm."
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lacto- 
before vowels, lac-, word-forming element used in chemistry and physiology from 19c. and meaning "milk," from Latin lac (genitive lactis) "milk," from Proto-Italic *(g)lagt-, from PIE root *g(a)lag- "milk." This and the separate root *melg- (source of milk (n.)) account for words for "milk" in most of the Indo-European languages. The absence of a common word for it is considered a mystery. Middle Irish lacht, Welsh llaeth "milk" are loan words from Latin.
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