Annularia

noun

An·​nu·​lar·​ia

ˌanyəˈla(a)rēə

: a large genus of fossil pteridophytic plants of the order Equisetales having annuli formed by the basal sheaths of the leaf whorls

Word History

Etymology

New Latin, from Latin annulus + New Latin -aria

First Known Use

1830, 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!