n 1  :  a small cactus of the genus Lophophora (L. williamsii) with rounded stems covered with jointed tubercles that are used as a stimulant and antispasmodic esp. among the Mexican Indians  2 a  :  a usu. colorless Mexican liquor distilled esp. from the central leaves of any of various fleshy-leaved agaves  b  :  a plant from which mescal is produced .
 
   
 
Similar sounding terms:  me·so·coele  mus·cle 
 
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