n. A thick, viscous, or coagulated mass or lump, as of blood.n. A clump, mass, or lump, as of clay.n. A compact group: a clot of automobiles blocking the tunnel's entrance. verb-intransitive. To form into a clot or clots; coagulate.v. To cause to form into a clot or clots. See Synonyms at coagulate.v. To fill or cover with or as if with clots.