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English definition of “cactus”

cactus

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