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"discharge from the uterus after childbirth," 1680s, Modern Latin, from Greek lokhia, neuter plural of lokhios "pertaining to childbirth," from lokhos "a lying in, childbirth," also, "an ambush," from PIE root *legh- "to lie, lay" (see lie (v.2)).
lochia lo·chi·a (lō'kē-ə, lŏk'ē-ə)
The normal uterine discharge of blood, tissue, and mucus from the vagina after childbirth.