/ Dictionary / Index Y Yb: Meaning and Definition of Find definitions for: Yb Pronunciation: [key] — Symbol, Chem. ytterbium. Y.B. Pronunciation: [key] yearbook. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: yb (Thesaurus) Yazoo Y chromosome Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language