The Collaborative International Dictionary of English v.0.48:
caseate \caseate\ v. i. 1. to turn into cheese; -- of milk. [WordNet 1.5] 2. to undergo caseation; -- of dead tissue. [WordNet 1.5]WordNet (r) 3.0 (2006):
caseate v 1: turn into cheese; "The milk caseated" 2: become cheeselike; "necrotic tissue caseates"