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!
Origin and Etymology of helianthemum
New Latin, from 1heli- + -anthemum
Seen and Heard
What made you want to look up helianthemum? Please tell us where you read or heard it (including the quote, if possible).