1. a mass or lump.
  2. a semisolid mass, as of coagulated blood.
  3. a small compact group of individuals: a clot of sightseers massed at the entrance.
  4. British Informal. blockhead, dolt, clod.

verb (used without object), clot·ted, clot·ting.

  1. to form into clots; coagulate.

verb (used with object), clot·ted, clot·ting.

  1. to cause to clot.
  2. to cover with clots: Carefully aimed snowballs clotted the house.
  3. to cause to become blocked or obscured: to clot the book’s narrative with too many characters.


  1. a soft thick lump or massa clot of blood
  2. British informal a stupid person; fool

verb clots, clotting or clotted

  1. to form or cause to form into a soft thick lump or lumps

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

  1. A soft, nonrigid, insoluble mass formed when blood or lymph gels.


  1. To coagulate.

  1. 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.

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