Pectoral-fin meaning

Either of the anterior pair of fins attached to the pectoral girdle of fishes, corresponding to the forelimbs of other vertebrates.
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Either of a pair of fins, associated with the pectoral girdle, just behind the head of a fish, corresponding to the forelimbs of a higher vertebrate.
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(ichthyology) Either of two fins located on each side of a fish just behind the head.
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