soothing or mollifying, as a medicinal substance.
a demulcent substance or agent, often mucilaginous, as for soothing or protecting an irritated mucous membrane.

1725–35; < Latin dēmulcent- (stem of dēmulcēns, present participle of dēmulcere to stroke down, soften), equivalent to dē- de- + mulc(ere) to soothe + -ent- -ent Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demulcent (dɪˈmʌlsənt)
1.  soothing; mollifying
2.  a drug or agent that soothes the irritation of inflamed or injured skin surfaces
[C18: from Latin dēmulcēre to caress soothingly, from de- + mulcēre to stroke]

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

1732, from L. demulcentem, prp. of demulcere "to stroke down, soothingly pet," from de- + mulcere "to soothe."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

demulcent de·mul·cent (dĭ-mŭl'sənt)
Relieving irritation; soothing. n.
A soothing, usually mucilaginous or oily substance, such as glycerin or lanolin, used especially to relieve pain in inflamed or irritated mucous membranes.

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
Medically, it is used as a demulcent to soothe irritations, particularly of the mucous membranes.
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