adjective cy·an·e·ous \-ēəs\
variants: or



Definition of cyaneous

  1. 1 :  cerulean

  2. 2 :  of a dark blue

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 cyaneous

cyaneous from Latin cyaneus dark blue; cyanean from Latin cyaneus + English -an

Seen and Heard

What made you want to look up cyaneous? 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!