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|Noun||1.||Lophophora williamsii - a small spineless globe-shaped cactus; source of mescal buttons|
cactus - any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines
genus Lophophora, Lophophora - two species of small cacti of northeastern Mexico and southwestern United States having rounded stems covered with jointed tubercles: mescal