/ Dictionary / Index A arseno: Meaning and Definition of Find definitions for: ar•se•no Pronunciation: (är'su-nō"), [key] — adj. Chem. containing the arseno group. arseno- Pronunciation: [key] a combining form representingorin the formation of compound words: arsenopyrite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arseniuretted hydrogen arseno group Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language