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Meaning of septarium

sep•tar•i•um

Pronunciation: (sep-târ'ē-um), [key]
— pl. -tar•i•a
  1. 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.