Cir·​si·​um | \ ˈsərs(h)ēəm \

Definition of Cirsium

: a widely distributed genus of prickly herbs (family Compositae) having the bristles of the pappus plumose — compare carduus — see bull thistle

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 Cirsium

New Latin, from Greek kirsion, a thistle, probably from kirsos swollen vein; from the use of the thistle in antiquity in the treatment of swollen veins

Keep scrolling for more

Learn More about Cirsium

Statistics for Cirsium

Cite this Entry

“Cirsium.” Dictionary, Merriam-Webster, Accessed 28 Oct. 2020.

Comments on Cirsium

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


Test Your Vocabulary

Namesakes Word Quiz

  • a citrus fruit possibly named after a person
  • Which of the following is a fruit named after a Moroccan seaport?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

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!