: a genus of tropical American saltwater and freshwater fishes comprising the four-eyed fishes, being closely related to the topminnows but constituting a separate family, and having the eyes divided into an upper and lower division by the growth of two processes of the iris across the pupil and a band of conjunctiva across the cornea, the upper part serving to see objects in the air, the lower part to see objects under water
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Merriam-Webster unabridged
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