Het′er‐ol″o‐gous (?), a. [Hetero- + Gr. � proportion.] Characterized by heterology; consisting of different elements, or of like elements in different proportions; different; — opposed to homologous; as, heterologous organs.
Heterologous stimulus. (Physiol.) See under Stimulus. — Heterologous tumor(Med.), a tumor differing in structure from the normal tissues of the body.