What is the plural form of the word "cactus"?
Cactus has a Latin root that derives from the plural cacti, which makes cacti the technically proper plural spelling. If you want to stay on the right side of the rulebook, you can refer to more than one cactus as cacti.
At the same time, as cactus was assimilated into English, it inevitably received English treatment, which often pluralizes a word by adding s or es. As a result, cactuses became an accepted plural as well
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