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 of pectoral fin
First recorded in 1760–70
Words nearby pectoral fin
pectinose,
pectize,
pectolite,
pectoral,
pectoral cross,
pectoral fin,
pectoral girdle,
pectoral muscle,
pectoral nerve,
pectoral sandpiper,
pectoral vein
British Dictionary definitions for pectoral fin
pectoral fin
noun
either of a pair of fins, situated just behind the head in fishes, that help to control the direction of movement during locomotion