1. A species of rock, arranged in layers and composed of quartz, feld-spar, and mica.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• oness,
• tness,
• geneis,
• newss,
• giess,
• uness,
• neises,
• gneres,
• geneius,
• neise,
• nemiss,
• oneis,
• kness,
• ghess,
• uniss,
• gnise,
• geneiss,
• gneise,
• gneisse,
• gniss

• gnash,
• neighs,
• news,
• gnus,
• -ness,
• genius.

The adjective form of the word "gneiss" is "gneissic".

The plural of the "gneiss" can be the "gneisses".

The singular of the "gneiss" can be the "gneiss".