/ Dictionary / Index M Marek's disease: Meaning and Definition of Find definitions for: Ma'rek's disease" Pronunciation: (mar'iks, mär'-), [key] — Vet. Pathol. Vet. Pathol. a contagious cancerous disease of poultry, caused by a herpesvirus and characterized by proliferation of lymphoid cells and paralysis of a limb or the neck. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mare Island mare liberum Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language