1. Geology. (of a constituent of a rock) formed elsewhere than in the rock where it is found.Compare authigenic.
  2. Immunology. allogeneic.

1888, from Greek allogenes “of another race, stranger,” from allos “other, different” (see allo-) + -genes “born” (see -gen) + -ic.

  1. Being genetically different although belonging to or obtained from the same species, as in tissue grafts.

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