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[klot] /klɒt/
a mass or lump.
a semisolid mass, as of coagulated blood.
a small compact group of individuals:
a clot of sightseers massed at the entrance.
British Informal. blockhead, dolt, clod.
verb (used without object), clotted, clotting.
to form into clots; coagulate.
verb (used with object), clotted, clotting.
to cause to clot.
to cover with clots:
Carefully aimed snowballs clotted the house.
to cause to become blocked or obscured:
to clot the book's narrative with too many characters.
Origin of clot
before 1000; Middle English; Old English clott lump; cognate with Middle Dutch klotte, German Klotz block, log (cf. klutz)
Related forms
declot, verb, declotted, declotting.
nonclotting, adjective
unclotted, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for clotted
Contemporary Examples
Historical Examples
  • In colour it is greyish brown, clotted all over with dark brown.

    The Ocean World: Louis Figuier
  • The shirt was clotted with blood; so were the mattress under him and the floor.

    The Underdog F. Hopkinson Smith
  • He was deadly pale, and his hair, which hung in dishevelled locks over his face, was clotted with blood.

    The Coral Island R.M. Ballantyne
  • His eyes were closed, and a stiff wisp of his fair hair was clotted with blood.

  • Under the left ear was a mass of clotted blood, which proclaimed the gateway of the bullet of death.

    Little Oskaloo Thomas Chalmers Harbaugh
British Dictionary definitions for clotted


a soft thick lump or mass: a clot of blood
(Brit, informal) a stupid person; fool
verb clots, clotting, clotted
to form or cause to form into a soft thick lump or lumps
Derived Forms
clottish, adjective
Word Origin
Old English clott, of Germanic origin; compare Middle Dutch klotte block, lump
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 clotted



Old English clott "a round mass, lump," akin to Dutch kloot "ball," Danish klods "a block, lump," German Klotz "lump, block;" probably related to cleat and clod.


early 15c., from clot (n.). Of fluids from 1590s. Related: Clotted; clotting.

Online Etymology Dictionary, © 2010 Douglas Harper
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clotted in Medicine

clot (klŏt)
A soft, nonrigid, insoluble mass formed when blood or lymph gels. v. clot·ted, clot·ting, clots
To coagulate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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clotted in Science
A soft insoluble mass formed when blood or lymph gels. During blood clotting, white blood cells, red blood cells, platelets, and various clotting factors interact in a cascade of chemical reactions initiated by a wound. When a body tissue is injured, calcium ions and platelets act on prothrombin to produce the enzyme thrombin. Thrombin then catalyzes the conversion of the protein fibrinogen into fibrin, a fibrous protein that holds the clot together. An abnormal clot inside the blood vessels or the heart (a thrombus or an embolus) can obstruct blood flow.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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