Dictionary
-gen
a combining form meaning “that which produces,” used in the formation of compound words:
endogen; hydrogen. Gen.
1. Mil.General.
2. Genesis.
3. Geneva.
gen.
1. gender.
2. general.
3. genitive.
4. genus.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.