This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Produced or growing from within.

adj. Originating or produced within an organism, tissue, or cell: endogenous secretions.

adj. produced, originating or growing from within

adj. of a disease, caused by factors within the body

adj. Increasing by internal growth and elongation at the summit, instead of externally, and having no distinction of pith, wood, and bark, as the rattan, the palm, the cornstalk.

adj. Originating from within; increasing by internal growth.

In bot.: Of or pertaining to the class of endogens; growing or proceeding from within: as, endogenous trees or plants; endogenous growth.

Originating within; internal; specifically, formed within another body, as spores within a sporangium.

In anat.: Same as autogenous.

Inclosed in a common cavity of the matrix, as cartilage-cells.

In geology, formed within a mass of rock or even within the earth itself: especially employed to describe the effects, in contact-metamorphism, produced in the intrusive rock itself, as distinguished from those in the walls.

adj. of or resembling an endogen

adj. derived or originating internally

"And as I said, thank goodness it was time-limited, but it made me realize that there are people who are suffering with what we call endogenous depression."

exogenous   

endogenous cell-formation   

endogeny    endogeneity   

exogenous    proinflammatory    microbial    intracellular    cytokine    heme    viral    peptide    lipid    antimicrobial