waterwing

Noun

water wing (plural water wings)

1. (archaic) One of two walls built on either side of the junction of a bridge with the bank of a river, to protect the abutment of the bridge and the bank from the action of the current.
2. Synonym of armband (“one of a pair of inflatable plastic bands, normally worn on the upper arms, to help the wearer (often a child) float in water and learn to swim”).

   Synonyms:

   armfloat, floaty, armband