verb (used with object)
to spread or daub (an oily, greasy, viscous, or wet substance) on or over something: to smear butter on bread.
to spread or daub an oily, greasy, viscous, or wet substance on: to smear bread with butter.
to stain, spot, or make dirty with something oily, greasy, viscous, or wet.
to sully, vilify, or soil (a reputation, good name, etc.).
to smudge or blur, as by rubbing: The signature was smeared.
Slang. to defeat decisively; overwhelm: They smeared the home team.
an oily, greasy, viscous, or wet substance, especially a dab of such a substance.
a stain, spot, or mark made by such a substance.
a smudge.
something smeared or to be smeared on a thing, as a glaze for pottery.
a small quantity of something spread thinly on a slide for microscopic examination.
vilification: a smear by a cheap gossip columnist.

before 900; (v.) Middle English smeren, smirien to rub with fat, anoint, Old English smirian, smerian, smerwan; cognate with Dutch smeren, German schmieren, Old Norse smyrja, smyrwa; (noun) in current senses derivative of the v.; compare obsolete smear fat, grease, ointment, Middle English smere, Old English smeoru, cognate with Dutch smear, German Schmer, Old Norse smjǫr grease, Greek smýris rubbing powder; see emery

smearer, noun
unsmeared, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
smear (smɪə)
1.  to bedaub or cover with oil, grease, etc
2.  to rub over or apply thickly
3.  to rub so as to produce a smudge
4.  to slander
5.  slang (US) to defeat completely
6.  (intr) to be or become smeared or dirtied
7.  a dirty mark or smudge
8.  a.  a slanderous attack
 b.  (as modifier): smear tactics
9.  a preparation of blood, secretions, etc, smeared onto a glass slide for examination under a microscope
[Old English smeoru (n); related to Old Norse smjör fat, Old High German smero, Greek muron ointment]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. smerian "to anoint or rub with grease, oil, etc.," from P.Gmc. *smerthan (cf. O.N. smyrva, Dan. smøre, Swed. smörja, Du. smeren, O.H.G. smirwen, Ger. schmieren "to smear"), from PIE *smeru- "grease" (cf. Gk. myron "unguent, balsam," O.Ir. smi(u)r "marrow," O.E. smeoru "fat, grease").
Sense of "assault a public reputation with unsubstantiated charges" is from 1879. Noun meaning "mark or stain left by smearing" is first recorded 1611; sense of "small quantity prepared for microscopic examination" is from 1903.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

smear (smēr)
A sample, as of blood or bacterial cells, spread thinly on a slide and usually stained for microscopic examination or applied to the surface of a culture medium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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