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.
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.
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.