laxative

[lak-suh-tiv]
noun
1.
a medicine or agent for relieving constipation.
adjective
2.
of, pertaining to, or constituting a laxative; purgative.
3.
Archaic.
a.
(of the bowels) subject to looseness.
b.
(of a disease) characterized by looseness of the bowels.

Origin:
1350–1400; Middle English laxatif (< Middle French) < Medieval Latin laxātīvus loosening (see laxation, -ive)

laxatively, adverb
laxativeness, noun
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World English Dictionary
laxative (ˈlæksətɪv)
 
n
1.  an agent stimulating evacuation of faeces
 
adj
2.  stimulating evacuation of faeces
 
[C14 (originally: relaxing): from Medieval Latin laxātīvus, from Latin laxāre to loosen]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

laxative
late 14c., from O.Fr. laxatif, from M.L. laxativus, from L. laxatus, pp. of laxare "loosen," from laxus "loose, lax" (see lax). The noun meaning "a laxative medicine" is from late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

laxative lax·a·tive (lāk'sə-tĭv)
n.
A food or drug that stimulates evacuation of the bowels. adj.
Stimulating evacuation of the bowels.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Fecal impaction is often seen in people who have had constipation for a long
  time and have been using laxatives.
Impaction is even more likely when the laxatives are stopped suddenly.
Additionally, bulk laxatives such as psyllium may help add fluid and bulk to
  the stool.
Suppositories or gentle laxatives, such as milk of magnesia liquid, may
  establish regular bowel movements.
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