Septarium

‖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.