/ Dictionary / Index S sweet birch: Meaning and Definition of Find definitions for: sweet' birch' Pronunciation: [key] a North American tree, Betula lenta, having smooth, blackish bark and twigs that are a source of methyl salicylate. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sweet bay sweet birch oil Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language