/ Dictionary / Index S sac: Meaning and Definition of Find definitions for: sac Pronunciation: (sak), [key] — n. a baglike structure in an animal, plant, or fungus, as one containing fluid. Sac Pronunciation: (sak, sôk), [key] — pl. Sacs, Sac. Sauk. SAC Pronunciation: (sak), [key] Strategic Air Command. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sac (Thesaurus) sabulous Sacajawea Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language