Sedative
来自Big Physics
late Middle English: from Old French sedatif or medieval Latin sedativus, from Latin sedat- ‘settled’, from the verb sedare (see sedate1).
etymonline
sedative (adj.)
"tending to calm or soothe," early 15c., from Medieval Latin sedativus "calming, allaying," from sedat-, past participle stem of sedare, causative of sedere "to sit," from PIE root *sed- (1) "to sit." The noun derivative meaning "a sedative drug" is attested from 1785. Hence, "whatever soothes or allays."
