The Collaborative International Dictionary
Gneissic
Gneissic \Gneis"sic\ (n[imac]s"s[i^]k), a. Relating to, or resembling, gneiss; consisting of gneiss.
Wiktionary
gneissic
a. (context geology English) of or relating to gneiss
Usage examples of "gneissic".
But the disposition of the ruins, which lay in a sort of arc for almost the entire extent of a low, gneissic, league-long elevation of bare, eroded stone, together with the type of architecture, soon convinced us that we had found our goal.