GNU Collaborative International Dictionary of English

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1.       
   Houseleek , n. [House + leek.] (Bot.) A succulent plant of the genus Sempervivum (Sempervivum tectorum), originally a native of subalpine Europe, but now found very generally on old walls and roofs. It is very tenacious of life under drought and heat; -- called also ayegreen.
   1913 Webster