Each of a pair of fins situated on either side just behind a fish's head, helping to control the direction of movement during locomotion. They correspond to the forelimbs of other vertebrates.
〔动〕胸鳍
Example sentencesExamples
Look at the shape and size of the dorsal fin, pectoral fins, and the caudal fin.
Paired pectoral fins and a dorsal fin were present, and the caudal fin was asymmetrical with a large upper lobe.
They have one caudal fin, one dorsal fin, two pelvic fins, one anal fin, and two pectoral fins.
They have strong pectoral fins with spines that are serrated on the outer side.
One of the fossil's most intriguing aspects is the large, paired spines on the shark's pectoral fins, the side fins used for steering.
Definition of pectoral fin in US English:
pectoral fin
noun
Zoology
Each of a pair of fins situated on either side just behind a fish's head, helping to control the direction of movement during locomotion. They correspond to the forelimbs of other vertebrates.
〔动〕胸鳍
Example sentencesExamples
Paired pectoral fins and a dorsal fin were present, and the caudal fin was asymmetrical with a large upper lobe.
One of the fossil's most intriguing aspects is the large, paired spines on the shark's pectoral fins, the side fins used for steering.
They have strong pectoral fins with spines that are serrated on the outer side.
They have one caudal fin, one dorsal fin, two pelvic fins, one anal fin, and two pectoral fins.
Look at the shape and size of the dorsal fin, pectoral fins, and the caudal fin.