lymphoid Syllabification: (lym·phoid)Pronunciation: /ˈlimˌfoid/Definition of lymphoid adjective Anatomy & Medicine of, relating to, or denoting the tissue responsible for producing lymphocytes and antibodies. This tissue occurs in the lymph nodes, thymus, tonsils, and spleen, and dispersed elsewhere in the body. lymphoid in other Oxford dictionaries Definition of lymphoid in the British & World English dictionary