( used with a singular or plural verb ) Pathology .

an acute infectious disease occurring mostly in children, characterized by catarrhal and febrile symptoms and an eruption of small red spots; rubeola.

any of certain other eruptive diseases. Compare German measles .

Veterinary Pathology . a disease in swine and other animals caused by the larvae of certain tapeworms of the genus Taenia.

( used with a plural verb ) the larvae that cause measles in swine and other animals, and that upon maturation produce trichinosis in humans.