/ Dictionary / Index B B horizon: Meaning and Definition of Find definitions for: B horizon Pronunciation: [key] — Geol. Geol. the subsoil in a soil profile. Cf. A horizon, C horizon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bhopal bhp Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language