Hăr'mo-tōme, n.

n. [Fr. harmotome; Gr. ἀρμός, a joint, and τόμος, a cut, from τέμνειν, to cut.] (Min.) A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone. ☞ A related mineral, called lime-harmotome, and Phillipsite, contains lime in place of baryta. Dana.