The Collaborative International Dictionary of English v.0.48:

Clot \Clot\ (kl[o^]t), n. [OE. clot, clodde, clod; akin to D.
   kloot ball, G. kloss clod, dumpling, klotz block, Dan. klods,
   Sw. klot bowl, globe, klots block; cf. AS. cl[=a]te bur. Cf.
   Clod, n., Clutter to clot.]
   A concretion or coagulation; esp. a soft, slimy, coagulated
   mass, as of blood; a coagulum. "Clots of pory gore."
   --Addison.
   [1913 Webster]

         Doth bake the egg into clots as if it began to poach.
                                                  --Bacon.
   [1913 Webster]

   Note: Clod and clot appear to be radically the same word, and
         are so used by early writers; but in present use clod
         is applied to a mass of earth or the like, and clot to
         a concretion or coagulation of soft matter.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clot \Clot\, v. i. [imp. & p. p. Clotted; p. pr. & vb. n.
   Clotting.]
   To concrete, coagulate, or thicken, as soft or fluid matter
   by evaporation; to become a cot or clod.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clot \Clot\, v. t.
   To form into a slimy mass.
   [1913 Webster]

WordNet (r) 3.0 (2006):

clot
    n 1: a lump of material formed from the content of a liquid
         [syn: clot, coagulum]
    v 1: change from a liquid to a thickened or solid state;
         "coagulated blood" [syn: clot, coagulate]
    2: cause to change from a liquid to a solid or thickened state
       [syn: clot, coagulate]
    3: turn into curds; "curdled milk" [syn: curdle, clabber,
       clot] [ant: homogenise, homogenize]
    4: coalesce or unite in a mass; "Blood clots" [syn: clog,
       clot]