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Definition of cactus noun from the Oxford Advanced Learner's Dictionary

cactus

noun
 
/ˈkæktəs/
 
/ˈkæktəs/
(plural cactuses, cacti
 
/ˈkæktaɪ/
 
/ˈkæktaɪ/
)
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  1. a plant that grows in hot dry regions, especially one with thick stems covered in spines but without leaves. There are many different types of cactus.Topics Plants and treesc1
    Word Originearly 17th cent.: from Latin, from Greek kaktos ‘cardoon’ (a tall plant with leaves and roots that can be eaten as a vegetable).
See cactus in the Oxford Advanced American Dictionary
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