limonite, n. [Gr. leimw`n any moist grassy place, a meadow: cf. F. limonite, G. limonit.].
Hydrous sesquioxide of iron, an important ore of iron, occurring in stalactitic, mammillary, or earthy forms, of a dark brown color, and yellowish brown powder. It includes bog iron. Also called brown hematite. [1913 Webster]