What's the "een" in Halloween?
early 15c., from Latin coagulatus, past participle of coagulare "to cause to curdle," from cogere "to curdle, collect" (see cogent). Earlier coagule, c.1400, from Middle French coaguler. Related: Coagulated; coagulating.
coagulate co·ag·u·late (kō-āg'yə-lāt')
v. co·ag·u·lat·ed, co·ag·u·lat·ing, co·ag·u·lates
To change from the liquid state to a solid or gel; clot.