Lewis Short
(verb) : crassĭfĭco, āvi, ātum, 1, crassusfacio
* To make thick, thicken, make fat, fatten, Cael. Aur. Tard. 2, 14, 208; 5, 2, 39 al.— Pass., to thicken, become dense, Cael. Aur. Tard. 2, 13, 180.
Charlton T. Lewis, Charles Short, A Latin Dictionary