Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

psilomelane

noun
psi·​lo·​mel·​ane | \ ˌsīlōˈmeˌlān\
plural -s

Definition of psilomelane

: a basic oxide of barium and bivalent and quadrivalent manganese probably BaMnMn8O16(OH)4 — compare hollandite, coronadite

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for psilomelane

psil- + -melane

Keep scrolling for more

Learn More about psilomelane

Statistics for psilomelane

Look-up Popularity

Comments on psilomelane

What made you want to look up psilomelane? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

suffuse

Listen to the pronounciation of suffuse

to spread over or through

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games