/ Dictionary / Index Y Yellow No. 5: Meaning and Definition of Find definitions for: Yellow No. 5 Pronunciation: [key] a yellow dye used in food, drugs, cosmetics, and other products: required by FDA regulations to be identified on food labels because of possible allergic reactions in sensitive individuals. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Yellow Newtown yellow pad Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language