heterologous

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1. Derived from a different species: a heterologous graft.
2. Of or relating to cytologic or histological elements not normally occurring in a designated part of the body.
3. Immunologically related but not identical. Used of certain cells and antiserums.

[HETERO– + Greek logos, word, relation; see –logy + –OUS.]

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.

1. made up of tissue not normal to the part.
2. derived from an individual of a different species.

The adjective has 2 meanings:

Meaning #1: (biology) not corresponding in structure or evolutionary origin
  Synonyms: heterologic, heterological
  Antonyms: analogous (meaning #2), homologous (meaning #1)

Meaning #2: derived from organisms of a different but related species
  Antonyms: autologous (meaning #1), homologous (meaning #2)