a swimmer who swims with his/her hands (see Molina)
Alonso de Molina:
tlamaneloloyan. nadadero tal. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 125v. col. 2. Thanks to Joe Campbell for providing the transcription.