from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Exogenous.
  • adjective Able to live and develop outside a host, as certain pathogenic microorganisms do.

from The Century Dictionary.

  • Originating or developed outside of the host; externally parasitic: opposed to endogenous.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective zoology, of a pathogenic organism Able to survive outside of its host


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