ETYM Old Eng. clot, clodde, clod; akin to Dutch kloot ball, German kloss clod, dumpling, klotz block, Dan. klods, Swed. klot bowl, globe, klots block; cf. AS. clâte bur. Related to Clod, Clutter to clot.
A lump of material formed from the content of a liquid; SYN. coagulum.