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WordReference Random House Unabridged Dictionary of American English © 2024sep•tar•i•um (sep târ′ē əm),USA pronunciation n., pl. -tar•i•a (-târ′ē ə).USA pronunciation [Geol.]- Geologya 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.
- Neo-Latin sēptārium, equivalent. to Latin sēpt(um) enclosure (see septum) + -ārium -arium
- 1775–85;
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