From Middle English coagulaten (“(of blood) to clot or, make blood coagulate; (of tissue) to consolidate”), from coagulat(e) (“coagulated; (blood) clotted; (milk) curdled; (humor) thickened, viscous; (material) solidified, cohesive; (wine) boiled down, reduced”, also used as the past participle of coagulaten) + -en (verb-forming suffix), borrowed from Latin coāgulātus, the perfect passive participle of coāgulō (“to curdle, coagulate”), from coāgulum (“a means of curdling, rennet”), from cōgō (“bring together, gather, collect”) + -ulum (forms instrument nouns), from co- (“together”) + agō (“do, make, drive”). Doublet of quail. Displaced native Middle English irennen, from Old English ġerinnan, but not native curdle.
1
To become congealed; to convert from a liquid to a semisolid mass.
In cheese making, milk coagulates into curds that become cheese.
2
To cause to congeal.
Rennet coagulates milk; heat coagulates the white of an egg.
Etymology From Middle English coagulat(e) (“coagulated; (blood) clotted; (milk) curdled; (humor) thickened, viscous; (material) solidified, cohesive; (wine) boiled down, reduced”), also used as the past participle of coagulaten and of coagulate in Early Modern English, see -ate (adjective-forming suffix) and Etymology 1 for more.
roasted in wrath and fire, / And thus o'er-sized with coagulate gore,c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act II, scene ii], line 460:
coagulate
noun
UK /kəʊˈæɡ.jʊ.lət/ · US /koʊˈæɡ.jə.lət/
Etymology From New Latin coāgulātum, substantivized from the nominative neuter singular of coāgulātus, see -ate (noun-forming suffix) and Etymology 1 for more.