het·er·ol·o·gous 
(hĕt′ə-rŏlə-gəs)
(hĕt′ə-rŏlə-gəs)adj.
1.
a. Not corresponding or similar in position, value, structure, or function; not homologous.
b. Biology Relating to traits, such as organs or body parts, that do not correspond in structure or evolutionary origin.
2. Derived from a different species: a heterologous transplant; a heterologous gene.
3. Genetics Relating to chromosomes that do not normally pair during mitosis or meiosis.
4. Relating to cells or tissues that do not usually occur in a given part of the body: a heterologous tumor.
5. Immunology
a. Relating to a vaccine or serum that confers immunity against a pathogen that is not identical to but is immunologically related to the pathogen used to create the vaccine or serum.
b. Relating to an antigen and antibody that do not correspond to one another.
[HETERO- + Greek logos, word, relation; see -LOGY + -OUS.]
het′er·olo·gy (-jē) n.
het′er·olo·gous·ly adv.