/ Dictionary / Index S septarium: Meaning and Definition of Find definitions for: sep•tar•i•um Pronunciation: (sep-târ'ē-um), [key] — pl. -tar•i•a a concretionary nodule or mass, usually of calcium carbonate or of argillaceous carbonate of iron, traversed within by a network of cracks filled with calcite and other minerals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. septal septate Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language