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The Collaborative International Dictionary of English v.0.48:

Disthene \Dis"thene\, n. [Gr. di- = di`s- twice + ? force: cf. F. disth[`e]ne.] (Min.) Cyanite or kyanite; -- so called in allusion to its unequal hardness in two different directions. See Cyanite. [1913 Webster]