'Sedative' definitions:

Definition of 'sedative'

From: WordNet
adjective
Tending to soothe or tranquilize; "valium has a tranquilizing effect"; "took a hot drink with sedative properties before going to bed" [syn: ataractic, ataraxic, sedative, tranquilizing, tranquillizing, tranquilising, tranquillising]
noun
A drug that reduces excitability and calms a person [syn: sedative, sedative drug, depressant, downer]

Definition of 'Sedative'

From: GCIDE
  • Sedative \Sed"a*tive\, a. [Cf. F. s['e]datif.] Tending to calm, moderate, or tranquilize; specifically (Med.), allaying irritability and irritation; assuaging pain. [1913 Webster]

Definition of 'Sedative'

From: GCIDE
  • Sedative \Sed"a*tive\, n. (Med.) A remedy which allays irritability and irritation, and irritative activity or pain. [1913 Webster]