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to change from a fluid into a thickened mass; curdle; congeal:
Let the pudding stand two hours until it coagulates.
Biology. (of blood) to form a clot.
Physical Chemistry. (of colloidal particles) to flocculate or cause to flocculate by adding an electrolyte to an electrostatic colloid.
Obsolete. coagulated.
Historical Examples

And many bodies will coagulate upon commixture, whose separated natures promise no concretion.
The Works of Sir Thomas Browne (Volume 1 of 3) Thomas Browne

The disintegrated mass of rabbits commenced, as it were, to solidify, to coagulate.
The Octopus Frank Norris

When mixed with water, which it does readily, its globules lose all their transparency, and coagulate into small clammy masses.
An Introduction to Entomology: Vol. IV (of 4) William Kirby

Rennet is added to the milk to coagulate it, and then the curd, from which nearly all the water is removed, is allowed to ripen.
Woman’s Institute Library of Cookery, Vol. 2 Woman’s Institute of Domestic Arts and Sciences

The acids cited will coagulate and cause the germ disk to turn white or yellow in a few hours.
Scientific American Supplement, No. 392, July 7, 1883 Various

That protein is present in both the yolk and the white is apparent from the fact that they coagulate when heat is applied.
Woman’s Institute Library of Cookery, Vol. 2 Woman’s Institute of Domestic Arts and Sciences

Both nutshells were quickly filled with the glutinous juice, which soon began to thicken and coagulate like rich cream.
Afloat in the Forest Mayne Reid

It would be much better to keep yellow latex apart, and coagulate it separately, if at all possible.
The Preparation of Plantation Rubber Sidney Morgan

It is also a well-established fact, that the blood does not coagulate after death from this cause.
The Mirror of Literature, Amusement, and Instruction, Vol. 13, Issue 372, Saturday, May 30, 1829 Various

In another of his works he remarks that the blood in certain diseased conditions will not coagulate.
Fathers of Biology Charles McRae

verb (kəʊˈæɡjʊˌleɪt)
to cause (a fluid, such as blood) to change into a soft semisolid mass or (of such a fluid) to change into such a mass; clot; curdle
(chem) to separate or cause to separate into distinct constituent phases
noun (kəʊˈæɡjʊlɪt; -ˌleɪt)
the solid or semisolid substance produced by coagulation
v.

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.
co·ag’u·la·bil’i·ty n.
co·ag’u·la’tor n.