Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

jacobsite

noun
ja·cobs·ite | \ˈjākəbˌzīt sometimes -kəpˌsīt\
plural -s

Definition of jacobsite 

: a black magnetic isometric mineral MnFe2O4 consisting of an oxide of manganese and iron and constituting a member of the magnetite series

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 jacobsite

French jakobsite, from Jakobsberg, Sweden, its locality + French -ite

Keep scrolling for more

Learn More about jacobsite

Dictionary Entries near jacobsite

jacobinia

jacobinize

Jacobite

jacobsite

Jacobson's organ

Jacobus

jaconet

Statistics for jacobsite

Look-up Popularity

Comments on jacobsite

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

Show Comments  Hide Comments 

WORD OF THE DAY

rebuff

to reject or criticize sharply

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
True or False

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

TAKE THE QUIZ
Word Winder's CrossWinder

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