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[bloch] /blɒtʃ/
a large, irregular spot or blot.
Plant Pathology.
  1. a diseased, discolored spot or area on a plant.
  2. a disease so characterized, usually accompanied by cankers and lesions.
a skin eruption; blemish.
verb (used with object)
to mark with blotches; blot, spot, or blur:
The floor of the forest was blotched with cool, dark moss.
Textiles. of or relating to blotch printing, or to the colored ground produced by this process.
Origin of blotch
1595-1605; perhaps blend of blot1 + botch2
1. splotch, mark, blemish, stain. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for blotch
  • In late spring, the plant is covered with fragrant white or pinkish white flowers with yellow blotch.
  • Genetic studies of net blotch resistance in a barley cross.
  • Similar levels of net blotch were found for both seeding dates.
  • Treatment thresholds for leaf and glume blotch in wheat.
  • The head has a large yellowish crescent or blotch behind the eyes and a distinct yellow spot under the eye on the lower jaw.
  • Selected lines were evaluated for malt quality and for spot blotch and net blotch reactions as described previously.
  • The longer sepals are hairless and have a greenish-yellow blotch at their base.
  • Its dorsal keel is less pronounced, and the crescent or blotch behind the eye is often narrower.
British Dictionary definitions for blotch


an irregular spot or discoloration, esp a dark and relatively large one such as an ink stain
to become or cause to become marked by such discoloration
(intransitive) (of a pen or ink) to write or flow unevenly in blotches
Word Origin
C17: probably from botch, influenced by blot1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for blotch

c.1600, perhaps a blend of blot and botch or patch.

Online Etymology Dictionary, © 2010 Douglas Harper
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blotch in Science
Any of several plant diseases caused by fungi and resulting in brown or black dead areas on leaves or fruit.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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