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From The Collaborative International Dictionary of English v.0.48:
Grease \Grease\ (gr[=e]s), n. [OE. grese, grece, F. graisse; akin to gras fat, greasy, fr. LL. grassus thick, fat, gross, L. crassus. Cf. Crass.] 1. Animal fat, as tallow or lard, especially when in a soft state; oily or unctuous matter of any kind. [1913 Webster] 2. (Far.) An inflammation of a horse's heels, suspending the ordinary greasy secretion of the part, and producing dryness and scurfiness, followed by cracks, ulceration, and fungous excrescences. [1913 Webster] Grease bush. (Bot.) Same as Grease wood (below). Grease moth (Zool.), a pyralid moth (Aglossa pinguinalis) whose larva eats greasy cloth, etc. Grease wood (Bot.), a scraggy, stunted, and somewhat prickly shrub (Sarcobatus vermiculatus) of the Spinach family, very abundant in alkaline valleys from the upper Missouri to California. The name is also applied to other plants of the same family, as several species of Atriplex and Obione. [1913 Webster]