Source : Webster's Revised Unabridged Dictionary (1913)

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} (Zo["o]l.), 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}.