n.one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming
同义词：pleopod
英汉双解大词典
swimmeret/ˈswɪməˌrɛt/
1.
N（名词）
any of the small paired appendages on the abdomen of crustaceans, used chiefly in locomotion and reproduction 游水足 (Also called pleopod)