Definition of cactus noun from the Oxford Advanced American Dictionary

 

cactus

 noun
noun
NAmE//ˈkæktəs//
 
(pl. cactuses or cacti
NAmE//ˈkæktaɪ//
 
)
 
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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 cactuses.
See the Oxford Advanced Learner's Dictionary entry: cactus