Definition of rabbitfish 

1 : a chimaera (Chimaera monstrosa) having a long tail and occurring in deep waters of the Atlantic ocean

2a : puffer fish

b : a slender elongated steel-blue marine food fish (Promethichthys prometheus) related to the escolar and widely distributed in warm regions

c southern Africa : any of several small slimy-skinned compressed fishes of the genus Siganus — compare siganidae

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History and Etymology for rabbitfish

rabbit + fish; from the rabbitlike nose

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exaggeratedly or childishly emotional

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