from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having a soothing, calming, or tranquilizing effect; reducing or relieving anxiety, stress, irritability, or excitement.
- n. An agent or a drug having a soothing, calming, or tranquilizing effect.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An agent or drug that sedates, having a calming or soothing effect, or inducing sleep.
- adj. Calming, soothing, inducing sleep, tranquilizing
from the GNU version of the Collaborative International Dictionary of English
- adj. Tending to calm, moderate, or tranquilize.
- n. A remedy which allays irritability and irritation, and irritative activity or pain.
from The Century Dictionary and Cyclopedia
- Tending to calm, tranquilize, or soothe; specifically, in medicine, having the power of allaying or assuaging irritation, irritability, or pain.
- n. Whatever soothes, allays, or assuages; specifically, a medicine or a medical appliance which has the property of allaying irritation, irritability, or pain.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. tending to soothe or tranquilize
- n. a drug that reduces excitability and calms a person
Middle English, from Old French sedatif, from Medieval Latin sēdātīvus, from Latin sēdātus, past participle of sēdāre, to calm; see sedate1.(American Heritage® Dictionary of the English Language, Fourth Edition)