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Source: Beekes, Robert. 2010. Etymological Dictionary of Greek. Leiden: Brill.
Reliability: High
Comment: ποῦς (stem ποδ-) has generalised o-grade ablaut throughout the nominal paradigm in Ancient Greek, however the e-grade is attested in some derivations: πέδη 'fetter, shackles', πέζα 'instep', πέζος 'walker, footsoldier', πέδον 'soil, earth, ground', πέδλιον 'sandal', πεδά 'after, with, amidst'. A zero-grade is also attested in ἐπίβδα 'the day after a festival'.