/ Dictionary / Index A arsino group: Meaning and Definition of Find definitions for: arsi'no group" Pronunciation: [key] — Chem. Chem. the univalent group HAs−. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arsino arsis Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language