Biology. of different origin; pertaining to heterology.
Medicine/Medical, Pathology. consisting of dissimilar tissue, as that of another species or that of a tumor.
Immunology. pertaining to an antigen that elicits a reaction in a nonspecific antibody.

1815–25; hetero- + -logous

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World English Dictionary
heterologous (ˌhɛtəˈrɒləɡəs)
1.  pathol of, relating to, or designating cells or tissues not normally present in a particular part of the body
2.  (esp of parts of an organism or of different organisms) differing in structure or origin

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American Heritage
Medical Dictionary

heterologous het·er·ol·o·gous (hět'ə-rŏl'ə-gəs)

  1. Of or relating to cytologic or histological elements not normally occurring in a designated part of the body.

  2. Derived from a different species, as a graft or transplant.

  3. Immunologically related but not identical. Used of certain cells and antiserums.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
heterologous   (hět'ə-rŏl'ə-gəs)  Pronunciation Key 
Derived or transplanted from a different species or source.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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