Similar words: flippant, flipping, flip, flip out, zipper, tipped, skipper, whippet. Meaning: ['flɪpə(r)] 
n. 1. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) 2. the flat broad limb of aquatic animals specialized for swimming.
n. 1. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) 2. the flat broad limb of aquatic animals specialized for swimming. 
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31. Flipper? Maybe those frisky crowd - pleasers at the aquarium?
32. But look at how I get the flipper effects with my feet and my ankle flexibility.
33. The leatherback accomplishes this by arranging the blood vessels in the base of as flipper into a countercurrent exchange system.