<p><strong>Noun</strong></p><ul><li>(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.</li><li>Any of certain other eruptive diseases.</li><li>Compare German measles.</li><li>Veterinary Pathology. A disease in swine and other animals caused by the larvae of certain tapeworms of the genus Taenia.</li><li>(used with a plural verb) The larvae that cause measles in swine and other animals, and that upon maturation produce trichinosis in humans.</li></ul>