swimmer

noun

1. One who swims.

   “The swimmer who is an expert does not exhibit his muscular force by violent movements, but exhibits some power which is invisible and which shows itself in perfect grace and reposefulness.”

   “In the summer of 1992, eight beaches were closed and swimmers were warned away because of colliform bacteria, caused by boaters emptying toilets directly into the lake or onto nearby shores. Park officials may soon supply the lake with floating waste disposal systems.”

2. A protuberance on the leg of a horse.
3. A webfooted aquatic bird.

   “The number of species of birds at present known from the various islands of the Molluccan group is 265, but of these only 70 belong to the usually abundant tribes of the waders and swimmers, indicating that these are very imperfectly known.”

4. (colloquial, in-plural)A sperm.
5. (UK, informal)A Norfolk dumpling.