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endogenous definition: 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. ...
Endorphins (contracted from endogenous morphine[note 1]) are endogenous opioid neuropeptides and peptide hormones in humans and other animals. They are produced by the central nervous system and the pituitary gland. The term endorphins implies a pharmacological activity (analogous to the activity of the corticosteroid category of biochemicals) as opposed to a specific chemical formulation. It consists of two parts: endo-and -orphin; these are short forms of the words endogenous and morphine, intended to mean a morphine-like substance originating from within the body.