noun he·li·o·phyl·lite \ˌhēlēōˈfiˌlīt\

Definition of heliophyllite



  1. :  a mineral approximately Pb6As2O7Cl4 consisting of oxychloride of lead and arsenic that is apparently dimorphous with ecdemite

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 heliophyllite

Swedish heliophyllit, from 1heli- + -phyll + -it -ite

Seen and Heard

What made you want to look up heliophyllite? 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!