What IS a cetacean?

Okay, so you all may be wondering, what is this thing you call a cetacean? Well, according to the Bing Dictionary it's a "large ocean mammal - a large ocean mammal that has a streamlined body with forelimbs modified as flippers, no hind limbs, and a blowhole on the back, e.g. a whale or a dolphin." Yes, this includes all whales and dolphins. This is a short little, blog. I hope it informed you. 

-Courtney-