Brewer's: Golden Thigh
Pythagoras is said to have had a golden thigh, which he showed to Abaris, the Hyperborean priest, and exhibited in the Olympic games. Pelops, we are told, had an ivory shoulder. Nuad had a silver hand (see Silver Hand), but this was artificial.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894