Webster's English Dictionary

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cactus

cac.tus \'kak-t*s\ \-.ti-, -(.)te-\ n or cac.ti or cac.tus.es [NL, genus 
   name, fr. L, cardoon, fr. Gk kaktos] pl  : any of a family (Cactaceae, the 
   cactus family) of plants with fleshy ste ms and branches with scales or 
   spines instead of leaves