plural -s
often capitalized
: a mineral Ca2Al2(PO4)2(OH)4.H2O consisting of a basic hydrous phosphate of calcium and aluminum

Word History


delta entry 1 (Greek letter) + -ite; from the triangular appearance of the crystals in cross section

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!

Dictionary Entries Near deltaite

Cite this Entry

“Deltaite.” Dictionary, Merriam-Webster, Accessed 18 Jun. 2024.

Love words? Need even more definitions?

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