Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Able to survive outside of its host

from The Century Dictionary and Cyclopedia

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

Etymologies

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