/ Dictionary / Index P proband: Meaning and Definition of Find definitions for: pro•band Pronunciation: (prō'band), [key] — n. Genetics. a patient who is the initial member of a family to come under study. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. probably probang Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language