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say it: KAK-tuhs
cactus is a noun meaning "any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines". It carries one recorded sense.
any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for cactus come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.