n 1  cap  :  a genus of plants (family Amaryllidaceae) native to tropical America and to the southwestern U.S., having heavy stiff often spiny leaves mostly in basal rosettes and tall spikes of flowers, and including some that are cultivated for their fiber (as sisal), for other economic products (as mescal), or for ornament  2  :  a plant (as the century plant) of the genus Agave .
 
 
 
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