depressant
dep·res·sant
adjective
1.
capable of depressing physiological or psychological activity or response by a chemical agent
noun
1.
a drug that reduces excitability and calms a person
Origin
From depress + -ant.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.