capitalized : a genus of tall erect or sometimes much-branched American annual or perennial herbs (family Compositae) comprising the sunflowers and having flower heads with purple or yellow disk flowers and showy yellow sterile rays see jerusalem artichoke
plural -es : any plant of the genus Helianthus

Word History


New Latin, from heli- entry 1 + -anthus

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 helianthus

Cite this Entry

“Helianthus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/helianthus. Accessed 25 Feb. 2024.

Love words? Need even more definitions?

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