/ Dictionary / Index B black measles: Meaning and Definition of Find definitions for: black' mea'sles Pronunciation: [key] — Pathol. Pathol. a severe form of measles characterized by dark, hemorrhagic eruptions. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Black Mass black mercuric sulfide Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language