Amazon river dolphin

noun
variants: or less commonly Amazon dolphin

Definition of Amazon river dolphin 

: boto Amazon river dolphins, or botos, have a curious habit: occasionally one will grab some river grass or a rock in its mouth and pop its head above the surface, showing its prize for all to see.— Henry Fountain, New York Times, 1 Apr. 2008 At up to 450 pounds and eight feet in length, the Amazon dolphin, or boto, is the largest of the four known species of river dolphin.— Mark Jenkins, National Geographic, June 2009

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First Known Use of Amazon river dolphin

1925, in the meaning defined above

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The first known use of Amazon river dolphin was in 1925

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