The Collaborative International Dictionary of English v.0.48:
Coagulant \Co*ag"u*lant\, n. [L. coagulans, p. pr.] That which produces coagulation. [1913 Webster]WordNet (r) 3.0 (2006):
coagulant n 1: an agent that produces coagulation [syn: coagulant, coagulator]