— hypersthenic /huy'peuhrs then"ik/ , adj.
/huy"peuhrs theen'/ , n. Mineral.
a dark iron magnesium silicate, an orthorhombic pyroxene containing more than 14 percent ferrous oxide. Cf. bronzite, enstatite .
[ 1800-10; HYPER- + Gk sthénos strength, might; r. hyperstene hyperstène ]