Definition of helianthemum in English:

helianthemum

noun

  • A low evergreen shrub with saucer-shaped flowers, which is grown as an ornamental.

    Also called rock rose
    • ‘More additions to the site will be coming soon including comprehensive guides to the cultivation and maintenance of Helianthemums.’
    • ‘Helianthemum tends to be more compact with a stiffer, straighter appearance to the stems.’

Origin

Modern Latin, from Greek hēlios sun + anthemon flower (because the flowers open in sunlight).

Pronunciation:

helianthemum

/ˌhiːlɪˈanθɪməm/