Rockrose \Rock"rose`\, n. (Bot.) A name given to any species of the genus Helianthemum, low shrubs or herbs with yellow flowers, especially the European H. vulgare and the American frostweed, H. Canadense.

Cretan rockrose, a related shrub (Cistus Creticus), one of the plants yielding the fragrant gum called ladanum.

Source: Webster's Revised Unabridged Dictionary (1913)