WordReference Random House Unabridged Dictionary of American English © 2025
perth•ite
(pûr′thīt),USA pronunciation n. Mineral
per•thit•ic
(pər thit′ik),USA pronunciation adj.
per•thit′i•cal•ly, adv.
- Mineralogya variety of feldspar containing irregular bands of albite in microcline.
- see -ite1 1832; named after Perth, Ontario, Canada