Definition of manganite
1
: a metallic gray to black mineral MnO(OH) that is a hydroxide and minor ore of manganese
2
: any of various unstable salts made by reaction of manganese dioxide with a base
Keep scrolling for more
Test Your Vocabulary
The Exceptions Quiz III
-
- Which of these words does not mean "nonsense"?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
Share manganite
Time Traveler for manganite
The first known use of manganite was in 1827
See more words from the same year