ce·ro 
(sîrō, sĕrō)
(sîrō, sĕrō)n. pl. ce·ros or cero
An edible fish (Scomberomorus regalis) of western Atlantic waters, having silvery sides and a dark-blue back.
[Alteration of Spanish sierra, saw, fish of the genus Scomberomorus (from the two lines of small fins, resembling the teeth of a saw, that run between the fish's dorsal and anal fins and its tail ); see SIERRA.]