Pronunciation: (en-doj'u-nus), [key]
1. proceeding from within; derived internally.
2. Biol.growing or developing from within; originating within.
3. Pathol.(of a disease) resulting from conditions within the organism rather than externally caused.
4. Biochem.pertaining to the metabolism of nitrogenous elements of cells and tissues.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.