noun
A person who swims, often used in formal or written contexts. More common in everyday speech is 泳いでいる人 or simply スイマー.
遊泳者は監視員の指示に従ってください。
Swimmers, please follow the lifeguard's instructions.
Refers to a swimmer with emphasis on skill or style, often used in competitive swimming.
Compound of 遊泳 (swimming) and 者 (person).