/ Dictionary / Index S senarmontite: Meaning and Definition of Find definitions for: sen•ar•mon•tite Pronunciation: (sen"ur-mon'tīt), [key] — n. a mineral, antimony trioxide, SbO, occurring in pearl-colored isometric octahedrons: a dimorph of valentinite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sen senary Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language