Meaning

noun the federal department responsible for maintaining a national energy policy of the United States; created in 1977

noun mature female of mammals of which the male is called `buck'

originFrom Middle English do (“(female) fallow deer”), from Old English dā, from Proto-West Germanic *daihā (“female deer, mother deer”), from Proto-Indo-European *dʰeh₁(y)- (“to suck (milk), to suckle”). Cognate with Middle Scots da, dae (“female fallow deer”), Danish då (“fallow deer”), Sanskrit धेनु (dhenú, “cow, milk-cow”), Old English dēon (“to suckle”), Old English delu (“teat”). Related also to…

Etymology from Wiktionary, CC BY-SA 3.0