alcēdōnĭa

I. the fourteen winter days during which the kingfisher broods and the sea is calm, v. alcedo.—Hence, trop., a deep calm, profound tranquillity: ludi sunt, tranquillum est, alcedonia sunt circum forum, Plaut. Cas. prol. 26: mare ipsum aiunt, ubi alcedonia sint, fieri feriatum, Front. Fer. Alc. 3.