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

 

cactus

 noun
noun
BrE BrE//ˈkæktəs//
 
; NAmE NAmE//ˈkæktəs//
 
(pl. cactuses, cacti
BrE BrE//ˈkæktaɪ//
 
; NAmE NAmE//ˈkæktaɪ//
 
)
Plants
 
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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 cactus. See related entries: Plants Word Origin early 17th cent.: from Latin, from Greek kaktos ‘cardoon’ (a tall plant with leaves and roots that can be eaten as a vegetable).
See the Oxford Advanced American Dictionary entry: cactus