dolphin
/ˈdɒlfɪn/noun
1
- a small gregarious toothed whale which typically has a beak-like snout and a curved fin on the back. Dolphins have become well known for their sociable nature and high intelligence.海豚。
1.1
- Families Delphinidae (marine) and Platanistidae (the river dolphins): several genera and many species.海生海豚科和喙豚科（河豚）：数属, 多种。
1.2
- a dolphin-like creature depicted in Heraldry or art, typically with an arched body and fins like a fish（纹章或美术中描绘的, 多为身体弓形如鱼般有鳍的）海豚状动物。
3
- a bollard, pile, or buoy for mooring系船柱, 系船桩; 系船浮筒。
4
- a structure for protecting the pier of a bridge桥墩的保护结构。
词源
late Middle English: from Old French dauphin, from Provençal dalfin, from Latin delphinus, from Greek delphin.