'Gneissoid' definitions:
Definition of 'Gneissoid'
From: GCIDE
- Gneissoid \Gneis"soid\ (-soid), a. [Gneiss + -oid.] Resembling gneiss; having some of the characteristics of gneiss; -- applied to rocks of an intermediate character between granite and gneiss, or mica slate and gneiss. [1913 Webster]