- 1: Growing from or on the outside (as in exogenous spores). 2:
Caused by factors (as food or a traumatic factor) or an agent
(as a disease-producing organism) from outside the organism or
system (as in exogenous obesity, exogenous psychic depression).
3: Introduced from or produced outside the organism or system;
specifically: not synthesized within the organism or system.
Definition from: Merriam-Webster's Medical Dictionary by
Merriam-Webster Inc. Related discussion in the Handbook See also
Understanding Medical Terminology.