porphyroid

noun
por·​phy·​roid | \ ˈpȯ(r)fəˌrȯid\
plural -s

Definition of porphyroid

: a more or less schistose metamorphic igneous or sedimentary rock with porphyritic texture

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 porphyroid

porphyry + -oid

Keep scrolling for more

Comments on porphyroid

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

WORD OF THE DAY

to shake or wave menacingly

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
Spell It

Can you spell these 10 commonly misspelled words?

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!