Absolutely, the plural form of cactus is cacti or cactuses! We've got the Latin language to thank for the "cacti" version. It's like how we change "radius" to "radii", but you can also simply add an "es" to make "cactuses" in English. Both are perfectly acceptable. Now, the next time you see a group of these prickly plants in a desert scene, you can impress your friends by correctly calling them "cacti" or "cactuses", depending on your preference. It's one of those neat quirks in the English language that makes it so interesting to learn!
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