1 definition by CillaSaurus!

Top Definition
A cactus that is submerged in water.
An Underwater Cactus.
Combination of "aqua" and "cactus"
Person One: "Yo, what is that cactus doing with the fish in an aquarium?"
Person Two: "Oh, don't worry, it's an aquactus"
by CillaSaurus! June 06, 2009

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