"leather case for a pistol," 1663, probably from O.E. heolster,
"concealment, hiding place," from P.Gmc. *khelus-/*khulis-
(cf. O.H.G. huluft
"cover, case, sheath," O.N. hulstr
"case, sheath," M.Du. holster,
"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.