†πότερονpóteron, pot'-er-on; neuter of a comparative of the base of G4226; interrogative as adverb,
which (of two), i.e. is it this or that:—whether.
Thayer's Greek Lexicon
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STRONGS G4220:
πότερος, ποτερα, πότερον (from Homer down), which of two; πότερον... ἡ,utrum... an, whether... or (Winers Grammar, § 57, 1 b.; Buttmann, 250 (215)): John 7:17.