Webster’s Revised Unabridged Dictionary · 1913
Sedative
Sed′a·tive, a. [Cf. F. sédatif.] Tending to calm, moderate, or tranquilize; specifically (Med.), allaying irritability and irritation; assuaging pain.
Sed′a·tive, n. (Med.) A remedy which allays irritability and irritation, and irritative activity or pain.