[sed-uh-tiv] /ˈsɛd ə tɪv/
tending to calm or soothe.
allaying irritability or excitement; assuaging pain; lowering functional activity.
a sedative drug or agent.
1375–1425; late Middle English (adj.) (< Middle French sédatif) < Medieval Latin sēdātīvus, equivalent to Latin sēdāt(us) (see sedate) + -īvus -ive
Related forms
unsedative, adjective
Example Sentences for sedative
Pentobarbital is sedative, which is a medicine that makes you sleepy.
Prescription drugs used specifically for improving sleeping are called sedative hypnotics.
When he was finished, he injected a drug to counteract the sedative.
The sedative medications ward off convulsions and brain damage.
Depending on the amount taken in, nicotine can act as either a stimulant or a sedative.
It is a sedative to the viscera, a tonic, antipyretic.
Basically any sedative makes one slower by definition.
In medical school, a standard therapy was the sedative phenobarbital.
It had taken a few tries to find the vein, but the sedative was working.
Those who would do so should review the history of the sedative drug thalidomide.
British Dictionary definitions for sedative
sedative (ˈsɛdətɪv)
1.  having a soothing or calming effect
2.  of or relating to sedation
3.  med a sedative drug or agent
[C15: from Medieval Latin sēdātīvus, from Latin sēdātus assuaged; see sedate1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin and History for sedative
"tending to calm or soothe," early 15c., from M.L. sedativus "calming, allaying," from pp. stem of sedare (see sedate). The noun derivative meaning "a sedative drug" is attested from 1785.
Online Etymology Dictionary, © 2010 Douglas Harper
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sedative in Medicine

sedative sed·a·tive (sěd'ə-tĭv)
Having a soothing, calming, or tranquilizing effect; reducing or relieving anxiety, stress, irritability, or excitement. n.
An agent or a drug that produces a soothing, calming, or tranquilizing effect.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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sedative in Science
A drug having a calming or quieting effect, often given to reduce anxiety or to promote relaxation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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