say it: HOHL-stur
holster is a noun meaning "a sheath (usually leather) for carrying a handgun". It carries 2 recorded senses.
a sheath (usually leather) for carrying a handgun
a belt with loops or slots for carrying small hand tools
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for holster come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.