noun
also pro·to·gene ˈprōd.əˌjēn
( -s )
Etymology: protogine from French, from prot- + -gine (from Greek -genēs born); protogene alteration (influenced by -gene ) of protogine
1. : a granite that is especially prevalent in the central Alps and that has a gneissoid texture prob. due to dynamic action
2. : a rock with authigenic constituents