noun py·ro·sphere \-ˌsfi(ə)r\

Definition of pyrosphere

  1. 1 :  the hot central portion of the earth

  2. 2 :  a hypothetical spherical zone of molten magma that is held to intervene between the crust of the earth and a solid nucleus and to supply lava to volcanoes

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 pyrosphere

International Scientific Vocabulary pyr- + sphere

Seen and Heard

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


capable of being understood in two ways

Get Word of the Day daily email!