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The Collaborative International Dictionary
Incrassating

Incrassate \In*cras"sate\, v. t. [imp. & p. p. Incrassated; p. pr. & vb. n. Incrassating.] [L. incrassatus, p. p. of incrassare; pref. in- in + crassus thick.] To make thick or thicker; to thicken; especially, in pharmacy, to thicken (a liquid) by the mixture of another substance, or by evaporating the thinner parts.

Acids dissolve or attenuate; alkalies precipitate or incrassate.
--Sir I. Newton.

Liquors which time hath incrassated into jellies.
--Sir T. Browne.

Wiktionary
incrassating

vb. (present participle of incrassate English)