plural noun

Definition of Monocotyledoneae

: a subclass of Angiospermae comprising seed plants (as grasses and lilies) that produce an embryo with a single cotyledon and have usually parallel-veined leaves, stems without central pith or annual rings and with the vascular strands scattered throughout the ground tissue, and floral organs usually arranged in cycles of three or six, including some chiefly tropical arborescent plants (as the palms), but being chiefly herbaceous in habit — compare dicotyledoneae

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 Monocotyledoneae

New Latin, alteration of Monocotyledones, from mon- + cotyledones, plural of cotyledon

Keep scrolling for more

Learn More about Monocotyledoneae

Statistics for Monocotyledoneae

Cite this Entry

“Monocotyledoneae.” Dictionary, Merriam-Webster, Accessed 26 Nov. 2020.

Comments on Monocotyledoneae

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


Test Your Vocabulary

A Thanksgiving Word Quiz

  • a traditional thanksgiving dinner
  • November comes from a word for which of the following numbers?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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!