Source : Webster's Revised Unabridged Dictionary (1913)

Sedum \Se"dum\, n. [NL., fr. L. sedere to sit; so called in
   allusion to the manner in which the plants attach themselves
   to rocks and walls.] (Bot.)
   A genus of plants, mostly perennial, having succulent leaves
   and cymose flowers; orpine; stonecrop. --Gray.

Source : WordNet®

sedum
     n : any of various plants of the genus Sedum