plural noun

: an order of lower tracheophytes (subdivision Psilopsida) having a dichotomously branched sporophyte that is divided into aerial shoot and rhizome, lacks true roots, and has few or minute leaves, and having a gametophyte that is subterranean and free from chlorophyll see psilotaceae

Word History


New Latin, from Psilotum + -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!

Dictionary Entries Near Psilotales

Cite this Entry

“Psilotales.” Dictionary, Merriam-Webster, Accessed 20 Jul. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!