‖Sep‐ta″ri‐um (?), n.;pl.Septaria (#). [NL., fr. L. septum, saeptum, an inclosure, a partition, fr. sepire, saepire, to inclose.] (Geol.) A flattened concretionary nodule, usually of limestone, intersected within by cracks which are often filled with calcite, barite, or other minerals.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.