curdling curd·ling uncommon adjective (1) noun (1) adjective 1. turning into a solid mass “I waited for her to materialize out of the clogging curdling crowd” noun 1. the process of forming semisolid lumps in a liquid Synonymsclottingcoagulation Related words Word family coagulateclotcurdle Broader terms natural process Narrower terms blood coagulationthermocoagulation WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.