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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.