Cacti or cactuses?

What is the plural of cactus? Well, most people would say “cacti”, using the plural form of such Latin words. But wait, is it a Latin word? Cactus is actually from the Greek kaktos, the prickly cardoon plant.(An interesting derivation, given that the Greeks never saw a cactus, which is endemic to the Americas and so the Greeks, and Romans, had to wait many hundreds of years until Columbus and his ilk got to the New World.)

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