A small fish (family Hemiramphidae) with an unusually long lower jaw that extends much farther than its upper jaw, giving it an unbalanced appearance.
Compound of 'half' and 'beak,' named descriptively because the fish's distinctive lower jaw makes it appear to have only half a complete beak compared to normal fish.
Halfbeaks look like they got into a fight and lost—that extended lower jaw is actually perfect for skimming the surface of the water to catch insects, and they're popular in aquariums for their weird, wonderful appearance.
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