The Collaborative International Dictionary of English v.0.48:

Pes \Pes\ (p[=e]z), n.; pl. Pedes . [L., the foot.] (Anat.)
   The distal segment of the hind limb of vertebrates, including
   the tarsus and foot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pes
    n 1: the part of the leg of a human being below the ankle joint;
         "his bare feet projected from his trousers"; "armored from
         head to foot" [syn: foot, human foot, pes]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "pes":
   arch, clubfoot, digit, dog, extremity, fetlock, foot, forefoot,
   forepaw, harefoot, heel, hoof, instep, pad, pastern, patte, paw,
   pedal extremity, pedes, pied, pug, sole, splayfoot, toe, tootsy,
   trotter, ungula



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PES
       Programmed Electrical Stimulation


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PES
       Proposed Encryption Standard (cryptography)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PES
       Packetized Elementary Stream (DVB, ISO, IEC 13818-2/13818-3)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PES
       P-bit Errored Seconds (DS3/E3, BIT)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PES
       Photo-Electric Scanning (DTP)