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.
[1913 Webster]