/ Dictionary / Index B bay oil: Meaning and Definition of Find definitions for: bay' oil" Pronunciation: [key] a yellow essential oil distilled from the leaves of the tropical American bay, Pimenta racemosa, used in the manufacture of perfumes and bay rum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bay of Pigs bayonet Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language