The Collaborative International Dictionary
Sempervivum \Sem`per*vi"vum\, n. (Bot.) A genus of fleshy-leaved plants, of which the houseleek ( Sempervivum tectorum) is the commonest species.
Wiktionary
n. Any of the genus ''Sempervivum'' of succulent plants, the houseleeks or liveforevers.
Wikipedia
Sempervivum (Brit. , U.S. sem-per-VEE-vum) is a genus of about 40 species of flowering plants in the Crassulaceae family, commonly known as houseleeks. Other common names include liveforever (the source of the taxonomical designation Sempervivum, literally "always/forever alive") and hen and chicks, a name shared with plants of other genera as well. They are succulent perennials forming mats composed of tufted leaves in rosettes. In favourable conditions they spread rapidly via offsets, and several species are valued in cultivation as groundcover for dry, sunny locations.
Usage examples of "sempervivum".
On the flat, in sand alone, it does well, also on the top of a wall, such being a position especially provided for hardy sempervivums and a few cacti.
Its soft dull or greyish-green rosettes are in marked contrast with the rigid and shining sempervivums, in the company of which it is frequently placed.