Psilophytales

plural noun

Psi·​lo·​phy·​ta·​les

-ā(ˌ)lēz

: an order of Paleozoic simple dichotomously branched plants of Europe and eastern Canada including the oldest known land plants with vascular structure

Word History

Etymology

New Latin, from Psilophyton + -ales

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!