Definition of "gneissic" [gneis•sic]

• Of or relating to gneiss (adjective)

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• "The oldest rocks of Victoria Land are apparently banded gneiss and gneissic granite, which may be taken as Archaean."
• "Professor David and R. Priestley, the geologists of Shackleton's expedition, refer to Ferrar's and Prior's description of the foundation rocks, and state that according to their own investigations the foundation rocks consist of banded gneis, gneissic granite, grano-diorite, and diorite rich in sphene, besides coarse crystalline limestone as enclosures in the gneiss."
• "•Low mountains and high hills that are characteristically cored by gneissic rocks."