a. [ Hetero- + Gr. &unr_; proportion. ] Characterized by heterology; consisting of different elements, or of like elements in different proportions; different; -- opposed to homologous; as, heterologous organs. [ 1913 Webster ]
Heterologous stimulus. (Physiol.) See under Stimulus. -- Heterologous tumor (Med.), a tumor differing in structure from the normal tissues of the body. [ 1913 Webster ]