WordReference Random House Unabridged Dictionary of American English © 2026
fel•site
(fel′sīt),USA pronunciation n.
fel•sit•ic
(fel sit′ik),USA pronunciation adj.
- Rocksa dense, fine-grained, igneous rock consisting typically of feldspar and quartz, both of which may appear as phenocrysts.
- 1785–95; fels(par) + -ite1