plural noun
Di·​cot·​y·​le·​do·​ne·​ae | \ (ˌ)dīˌkätᵊləˈdōnēˌē\

Definition of Dicotyledoneae

: a subclass of Angiospermae comprising seed plants (such as cactuses and oaks) that produce an embryo with two cotyledons and have net-veined leaves, stems with secondary thickening resulting in annual ring formation in woody perennials, and floral organs usually arranged in cycles of four or five, including most of the deciduous woody plants of temperate climates and the majority of herbaceous flowering plants, and commonly being divided into Archichlamydeae and Metachlamydeae — compare monocotyledoneae

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 Dicotyledoneae

New Latin, alteration of Dicotyledones, from di- + cotyledones, plural of cotyledon

Keep scrolling for more

Comments on Dicotyledoneae

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


a topic to which one constantly reverts

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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!