endogenous

The definition of endogenous is coming from the inside.

(adjective)

An example of something endogenous is a tumor that is caused by conditions inside the body not by externally-introduced conditions such as smoking.

See endogenous in Webster's New World College Dictionary

adjective

Origin: endogen + -ous

See endogenous in American Heritage Dictionary 4

adjective

Produced or growing from within.
Originating or produced within an organism, tissue, or cell: endogenous secretions.

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