Laxative
来自Big Physics
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late Middle English: via Old French laxatif, -ive or late Latin laxativus, from Latin laxare ‘loosen’ (from laxus ‘loose’).
wiktionary
From Middle French laxatif, from Latin laxātīvus(literally “relaxing, loosening”)
etymonline
laxative (adj.)
late 14c., "causing relaxation or looseness," from Old French laxatif (13c.), from Medieval Latin laxativus "loosening," from Latin laxat-, past participle stem of laxare "loosen," from laxus "loose, lax" (see lax). The noun meaning "a laxative medicine, a medicine that relieves constipation by relaxing the intestines" is from late 14c.