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English definition of “cactus”

cactus

noun [C]     /ˈkæk.təs/ (plural cacti /ˈkæk.taɪ / or cactuses)
any of many types of desert plant usually with sharp spines and thick stems for storing waterCommon plants
(Definition of cactus noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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