Anableps

noun
An·a·bleps | \ ˈanəˌbleps \

Definition of Anableps 

: 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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First Known Use of Anableps

1804, in the meaning defined above

History and Etymology for Anableps

New Latin, from Greek anableps-, stem of anablepein to look up, from ana- + blepein to look

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The first known use of Anableps was in 1804

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occurring twice a year or every two years

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