Pharmacology. a liquid, usually aqueous or sometimes alcoholic preparation containing insoluble material in the form of a suspension or emulsion, intended for external application without rubbing, in such skin conditions as itching, infection, allergy, pain, or the like.
a liquid cosmetic, usually containing agents for soothing or softening the skin, especially that of the face or hands.

1350–1400; Middle English locion < Latin lōtiōn- (stem of lōtiō) a washing. See lotic, -ion

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World English Dictionary
lotion (ˈləʊʃən)
a liquid preparation having a soothing, cleansing, or antiseptic action, applied to the skin, eyes, etc
[C14: via Old French from Latin lōtiō a washing, from lōtus past participle of lavāre to wash]

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

c.1400, from O.Fr. lotion, from L. lotionem (nom. lotio) "a washing," from lotus, popular form of lautus, pp. of lavere "to wash" (see lave).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lotion lo·tion (lō'shən)

  1. A medicated preparation consisting of a liquid suspension or dispersion intended for external application.

  2. Any of various externally applied cosmetic liquids.

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
My pale skinned friend was suitably fried pink despite his protective lotion.
Cold wave lotion poisoning occurs from swallowing, breathing in, or touching
  cold wave lotion.
Do not put lotion between your toes if you have sores there.
The itching and inflammation may be treated with a lotion or steroid cream
  applied to the affected area of the skin.
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