hypersthene

noun

hy·​per·​sthene ˈhī-pərs-ˌthēn 

: an orthorhombic grayish or greenish black or dark brown pyroxene

hypersthenic

ˌhī-pərs-ˈthe-nik 

-ˈthē-

adjective

Word History

Etymology

French hypersthène, from Greek hyper- + sthenos strength

First Known Use

circa 1808, in the meaning defined above