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

picture of a cactus

cactus

noun

cactus pronunciation English

ˈkæktəs

cactus pronunciation American

ˈkæktəs

plural cactuses or cacti

cacti pronunciation English

ˈkæktaɪ

cacti pronunciation American

ˈkæktaɪ

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.