sempervivumPronunciation: /ˌsɛmpəˈvʌɪvəm/Definition of sempervivum noun a plant of a genus that includes the houseleek. Genus Sempervivum, family Crassulaceae Origin:modern Latin, from Latin semper 'always' + vivus 'living'sempervivum in other Oxford dictionaries Definition of sempervivum in the US English dictionary