"leather case for a pistol," 1663, probably from O.E.
heolster, earlier
helustr "concealment, hiding place," from P.Gmc.
*khelus-/*khulis- (cf. O.H.G.
huluft "cover, case, sheath," O.N.
hulstr "case, sheath," M.Du.
holster, Ger.
Holfster "holster"), from PIE
*kel- "to cover, to hide" (see
cell). Intermediate forms are wanting, and the modern word may as well be from the O.N. or M.Du. cognates.