pectoral-fin

pectoral fin

noun
(in fishes) either of a pair of fins usually situated behind the head, one on each side, and corresponding to the forelimbs of higher vertebrates.

Origin:
1760–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pectoral fin
 
n
either of a pair of fins, situated just behind the head in fishes, that help to control the direction of movement during locomotion

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