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Wiktionary
pistol shrimp

n. An alpheid shrimp which has asymmetrical claws, the larger of which can be used to produce a loud snapping sound.

WordNet
pistol shrimp

n. small shrimp that makes a snapping noise with one of their enlarged chelae [syn: snapping shrimp]

Usage examples of "pistol shrimp".

The pistol shrimp possesses one of nature's most innovative designs.