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]

Moby Thesaurus II by Grady Ward, 1.0:

159 Moby Thesaurus words for "clot":
   Devonshire cream, adhere, agglomerate, agglomeration, ament, array,
   assemble, batch, battery, beat up, blockhead, blood clot,
   blunderer, blunderhead, body, bonnyclabber, boor, born fool,
   botcher, breccia, bumbler, bunch, bunch up, bundle, bungler, cake,
   casein, churn, clabber, clasp, cleave, clinch, cling, cling to,
   clod, clodhopper, clodknocker, clotted cream, clown, clump,
   cluster, coagulate, coagulum, cohere, collect, colloid, colloidize,
   come together, concrete, concretion, congeal, congenital idiot,
   conglomerate, conglomeration, congregate, converge, copulate,
   couple, crassamentum, cream, cretin, crowd, curd, curdle, date,
   defective, dolt, embolus, embrace, emulsify, emulsionize,
   flock together, flow together, forgather, freeze to, fumbler, fuse,
   gang around, gang up, gather, gather around, gawk, gel, gelatinate,
   gelatinize, golem, gowk, grasp, grow together, grume, half-wit,
   hang on, hang together, herd together, hive, hold, hold on,
   hold together, horde, huddle, hug, idiot, imbecile, incrassate,
   inspissate, jell, jellify, jelly, juggins, klutz, knot, league,
   legumin, link, looby, lopper, loppered milk, lout, lubber, lump,
   mass, meet, merge, mill, mongoloid idiot, moron, muster, natural,
   natural idiot, natural-born fool, oaf, ox, paracasein, persist,
   rally, rally around, rendezvous, seethe, set, simp, simpleton,
   slouch, slubberer, solidify, stay, stay put, stick, stick together,
   stream, surge, swarm, take hold of, thick, thicken, thrombus,
   throng, unite, whip, yokel