Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

helianthemum

noun
he·​li·​an·​the·​mum | \ˌhēlēˈan(t)thəməm\

Definition of helianthemum 

1 capitalized : a geus of Eurasian herbs or undershrubs (family Cistaceae) having showy variously colored flowers with fugacious petals

2 plural -s : any plant of the genus Helianthemum

— called also rockrose, sunrose

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 helianthemum

New Latin, from heli- entry 1 + -anthemum

Keep scrolling for more

Learn More about helianthemum

Share helianthemum

Statistics for helianthemum

Look-up Popularity

Comments on helianthemum

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

Show Comments  Hide Comments 

WORD OF THE DAY

susurrous

full of whispering sounds

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Vocab Quiz

  • the-education-of-achilles-eugne-delacroix
  • Which is a synonym of discomfit?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ

Love words? Need even more definitions?

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

Words at Play

Ask the Editors

Word Games