/ Dictionary / Index B beta iron: Meaning and Definition of Find definitions for: be'ta i'ron Pronunciation: [key] — Metall. Metall. an allotrope of iron, stable between 768°C and 910°C, similar to alpha iron but nonmagnetic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. betaine betake Related Content Daily Word Quiz: frowzy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language