say it: sak
sac is a noun meaning "an enclosed space". It carries 4 recorded senses.
a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay
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 sac 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.