noun id·dings·ite \ˈidiŋˌzīt\

Definition of iddingsite



  1. :  a mineral consisting of a silicate of calcium, magnesium, and iron of doubtful composition and forming pseudomorphs after olivine

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of iddingsite

Joseph P. Iddings †1920 American geologist + English -ite

First Known Use: 1893

Seen and Heard

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


to cast off or become cast off

Get Word of the Day daily email!