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Related to hypersthenic: hyposthenic
A green, brown, or black splintery, cleavable pyroxene mineral, essentially (Fe,Mg)2Si2O6.
[French hypersthène : hyper-, extreme (from Greek huper-; see hyper-) + Greek sthenos, strength; see segh- in Indo-European roots.]
hy′per·sthen′ic (-thĕn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.