opuntia

n.
Any of various cacti of the genus Opuntia, especially the prickly pear.

[Latin (herba) Opūntia, Opuntian (herb), feminine of Opūntius, of Opus, an ancient town of east-central Greece, from Opūs, Opūnt-, Opus, from Greek Opous, Opount-.]

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American plant genus in family Cactaceae; spines cause stomatitis; called also prickly pear.

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The noun has one meaning:

Meaning #1: large genus of cactuses native to America: prickly pears
  Synonym: genus Opuntia

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