Hy″per‐sthene (hī″pẽr‐sthēn), n. [Gr. υπἕρ over + σθένοσ strength: cf. F. hyperstène.] (Min.) An orthorhombic mineral of the pyroxene group, of a grayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.