An Etymological Dictionary of Astronomy and Astrophysics

1. The terminal part of the vertebrate leg upon which an individual stands.
   

2. Something resembling a foot in position or use.

Etymology (EN): M.E., from O.E. fot; cf. O.S. fot, O.N. fotr, Du. voet, O.H.G. fuoz, Ger. Fuß, Goth. fotus “foot;” cognate with Pers. pâ, pây, as below.

Etymology (PE): Pâ “foot;” Mid.Pers. pâd, pây; Khotanese fad; Av. pad- “foot;” cf. Skt. pat; Gk. pos, genitive podos; L. pes, genitive pedis; E. foot, as above;
PIE *pod-/*ped-.