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.
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