holster n 1: a sheath (usually leather) for carrying a handgun 2: a belt with loops or slots for carrying small hand tools
Holster \Hol"ster\, n. [D. holster; skin to AS. heolstor den, cave, fr. helan to conceal, and to Icel. hulstr case, Goth. hulistr covering, veil, huljan to cover. [root]17. See {Hele} to cover, {Hell}, and cf. {Housing}, {Houss}.] A leather case for a pistol, carried by a horseman at the bow of his saddle, or worn on the person suspended from a belt or shoulder strap. [1913 Webster +PJC]