/ Dictionary / Index B Bessel: Meaning and Definition of Find definitions for: Bes•sel Pronunciation: (bes'ul), [key] — n. 1784–1846, German astronomer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bessel (Thesaurus) Bessarabia Bessel function Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language