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1. Main Entry: en·dog·e·nous
1 : growing or produced by growth from deep tissue <endogenous plant roots>
2 a : caused by factors inside the organism or system <an endogenous psychic depression> <endogenous business cycles> b : produced or synthesized within the organism or system <an endogenous hormone>
- en·dog·e·nous·ly adverb
2. Main Entry: ex·og·e·nous
Etymology: French exogène exogenous, from exo- + -gène (from Greek -genEs born) —more at -GEN
1 : produced by growth from superficial tissue <exogenous roots produced by leaves>
2 a : caused by factors (as food or a traumatic factor) or an agent (as a disease-producing organism) from outside the organism or system <exogenous obesity> <exogenous psychic depression> b : introduced from or produced outside the organism or system; specifically : not synthesized within the organism or system
- ex·og·e·nous·ly adverb