circumzenithal arc

noun cir·cum·zenithal arc

Definition of circumzenithal arc

  1. :  a bright rainbow-colored circular halo arc about the zenith as center convex to the sun and about 46 degrees above it

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 circumzenithal arc

International Scientific Vocabulary circum- + zenithal; originally formed as French circumzénithal

Seen and Heard

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


a brief usually trivial fact

Get Word of the Day daily email!