from The Century Dictionary.
- noun Anhydrous manganese dioxid (MnO2), a mineral of a light steel-gray color and hardness nearly equal to that of quartz.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy
manganese dioxide, occurring in hard tetragonal crystals
from Wiktionary, Creative Commons Attribution/Share-Alike License
Ancient Greek to become grey.
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