Do you know why a bicycle is called a bicycle and a unicycle is called a unicycle? It's because "uni" means "one" and "bi" means "two". Also, the "tri" from triangle means "three", and "quad" from "quadrilateral" means "four".
How many more words do you know with "uni", "bi", or "tri" in them?
Here are a few...
uniform, unique, binary, bisexual, tricycle, trivia
What do you call a vehicle with three wheels?
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