fender

:  a device that protects: as a (1) :  a cushion (as foam rubber or a wood float) between a boat and a dock or between two boats that lessens shock and prevents chafing (2) :  a pile or a row or cluster of piles placed to protect a dock or bridge pier from damage by ships or floating objects b :  railing c :  a device in front of locomotives and streetcars to lessen injury to animals or pedestrians in case of collision d :  a guard over the wheel of a motor vehicle e :  a low metal frame or a screen before an open fireplace f :  an oblong or triangular shield of leather attached to the stirrup leather of a saddle to protect a rider's legs