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γέλῳ

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

French (Bailly abrégé)

dat. épq. de γέλως.

Russian (Dvoretsky)

γέλῳ: v. l. γέλω эп. dat. к γέλως.