You searched for: “septarium
septarium (s) (noun), septaria (pl)
1. In geology, a concretionary (stone-like) nodule (round lump), typically consisting of ironstone, having radial cracks like waves that are filled with calcite or another mineral: "While traveling in the country, Jake and Jill were admiring the septaria near the mountains."
2. Etymology: from Latin septum, "enclosure".
This entry is located in the following unit: sept-, septi-, septo- (page 1)