/ Dictionary / Index B beta-naphthyl group: Meaning and Definition of Find definitions for: be'ta-naph'thyl group" Pronunciation: (bā'tu-naf'thil, -nap'- or, esp. Brit., bē'-), [key] — Chem. Chem. See underAlso called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. beta-naphthylamine Betancourt Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language