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ηὔδων

From LSJ

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at

Menander

French (Bailly abrégé)

impf. de αὐδάω.

Russian (Dvoretsky)

ηὔδων: и αὔδων impf. к αὐδάω.