Webster's English Dictionary

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clot

1. clot \'kla:t\ n [ME, fr. OE clott; akin to MHG klo-z lump, ball - more 
   at C]LOUT 1: a portion of a substance cleaving together in a thick 
   nondescript mass ( as of clay or gum) 2a: a roundish viscous lump formed by 
   coagulation of a portion of liquid or  by melting 2b: the coagulum produced 
   by clotting of blood  3: CLUSTER 
2. clot vb or clot.ted;  or clot.ting 1: to become a clot : form clots  2: 
   to undergo a sequence of complex chemical and physical reactions that r 
   esults in conversion of fluid blood into a coagulum : COAGULATE 1: to cause 
   to clot  2: to fill with clots