Metonic \Me*ton"ic\, a. [Cf. F. m['e]tonique.] Pertaining to, or discovered by, Meton, the Athenian. {Metonic} {cycle or year}. (Astron.) See under {Cycle}. Metonic \Me*ton"ic\, a. [Cf. F. m['e]tonique.] Pertaining to, or discovered by, Meton, the Athenian. {Metonic} {cycle or year}. (Astron.) See under {Cycle}.