WordReference Random House Unabridged Dictionary of American English © 2026
teph•ro•ite
(tef′rō īt′),USA pronunciation n.
- Mineralogya mineral, silicate of manganese, Mn2SiO4, occurring in orthorhombic crystals.
- Greek tephró(s) ash gray + German -it -ite1
- German Tephroit
- 1865–70