Agnotozoic

noun or adjective

Ag·​no·​to·​zo·​ic

ag-¦nō-tə-¦zō-ik,

¦ag-ˌnō-

: algonkian , proterozoic

Word History

Etymology

International Scientific Vocabulary agnoto- (from Greek agnōtos unknown) + -zoic

First Known Use

1887, in the meaning defined above

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!