/ Dictionary / Index S sodium meta-arsenite: Meaning and Definition of Find definitions for: so'dium met•a-ar'se•nite Pronunciation: (met"u-är'su-nīt"), [key] — Chem. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sodium lamp sodium metasilicate Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language