crasso, no perf., ātum, 1, v. a. [crassus],
to make thick, thicken, condense (postclass.): pili crassantur in setas, Ap. Met. 3, 24, 9; crassatus aër, Amm. 19, 4, 6; 19, 4, 8; 20, 3, 5.