\Gren`a*dier"\, n. [F. grenadier. See {Grenade}.]
1. (Mil.) Originaly, a soldier who carried and threw
   grenades; afterward, one of a company attached to each
   regiment or battalion, taking post on the right of the
   line, and wearing a peculiar uniform. In modern times, a
   member of a special regiment or corps; as, a grenadier of
   the guard of Napoleon I. one of the regiment of Grenadier
   Guards of the British army, etc.
2. (Zo["o]l.) Any marine fish of the genus {Macrurus}, in
   which the body and tail taper to a point; they mostly
   inhabit the deep sea; -- called also {onion fish}, and
   {rat-tail fish}.
3. (Zo["o]l.) A bright-colored South African grosbeak
   ({Pyromelana orix}), having the back red and the lower
   parts black.