/ Dictionary / Index F frontal bone: Meaning and Definition of Find definitions for: fron'tal bone' Pronunciation: [key] — Anat. Anat. a broad membrane bone of the skull, forming the forehead and the upper portion of each orbit. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. frontal frontal cyclone Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language