/ Dictionary / Index A arseno group: Meaning and Definition of Find definitions for: ar'seno group" Pronunciation: [key] — Chem. Chem. the bivalent group −As=As−. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arseno arsenolite Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language