Definitions

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek to become grey.

Examples

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