a particle of soot; sooty matter.
a black or dirty mark; smudge.
indecent language or publications; obscenity.
Plant Pathology.
a disease of plants, especially cereal grasses, characterized by the conversion of affected parts into black, powdery masses of spores, caused by fungi of the order Ustilaginales.
a fungus causing this disease.
verb (used with object), smutted, smutting.
to soil or smudge.
verb (used without object), smutted, smutting.
to become affected with smut, as a plant.

1580–90; akin to earlier smit (Old English smitte), by association with smudge, smutch

antismut, adjective
unsmutted, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
smut (smʌt)
1.  a small dark smudge or stain, esp one caused by soot
2.  a speck of soot or dirt
3.  something obscene or indecent
4.  a.  any of various fungal diseases of flowering plants, esp cereals, in which black sooty masses of spores cover the affected parts
 b.  any parasitic basidiomycetous fungus of the order Ustilaginales that causes such a disease
5.  angling a minute midge or other insect relished by trout
vb , smuts, smutting, smutted
6.  to mark or become marked or smudged, as with soot
7.  to affect (grain) or (of grain) to be affected with smut
8.  (tr) to remove smut from (grain)
9.  (tr) to make obscene
10.  (intr) to emit soot or smut
11.  (intr) angling (of trout) to feed voraciously on smuts
[Old English smitte; related to Middle High German smitze; associated with smudge, smutch]

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

1664, "black mark, stain," from verb smutten "debase, defile" (early 15c.), cognate with M.H.G. smotzen "make dirty," from W.Gmc. *smutt- (cf. M.H.G. smuz "grease, dirt," Ger. Schmutz "dirt," Ger. schmutzen "to make dirty"). The meaning "indecent or obscene language" is first attested 1668 (implied in
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
smut   (smŭt)  Pronunciation Key 
  1. Any of various bacidiomycete fungi that are parasitic on plants and are distinguished by the black, powdery masses of spores that appear as sooty smudges on the affected plant parts. Smuts are parasitic chiefly on cereal grasses like corn and wheat and can cause enormous damage to crops.

  2. Any of the various plant diseases caused by smuts, such as corn smut.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Corn smut, a fungus, has an unexpected benefit: a surprisingly good flavor.
Restoring it would require a visit to the police and a written pledge not to text smut again.
Information on smut of pearl millet is quite confused in the literature.
Several apparently unique species have been reported or implicated in the cause of smut diseases of pearl millet.
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