plural noun
Ly·​cop·​si·​da | \ līˈkäpsədə \

Definition of Lycopsida

: a subdivision of Tracheophyta coextensive with the class Lycopodineae comprising vascular plants (as the club mosses and related forms) with small leaves, sessile and adaxial sporangia, and no leaf gaps in the primary vascular cylinder — compare psilopsida , pteropsida , sphenopsida

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!

History and Etymology for Lycopsida

New Latin, from Latin lycopsis, a plant + New Latin -ida

Keep scrolling for more

Learn More about Lycopsida

Statistics for Lycopsida

Cite this Entry

“Lycopsida.” Dictionary, Merriam-Webster, Accessed 29 Oct. 2020.

Comments on Lycopsida

What made you want to look up Lycopsida? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Here Be Dragons: A Creature Identification Quiz

  • monster werewolf photo
  • Which is a synonym of werewolf?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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