swimmeret
noun
swim·mer·et
ˌswi-mə-ˈret
ˈswi-mə-ˌret
: one of a series of small unspecialized appendages under the abdomen of many crustaceans that are best developed in some decapods (such as a lobster) and usually function in locomotion or reproduction
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Merriam-Webster unabridged
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