One of the mysteries of the English language finally explained.
A surfboard, snowboard, etc., with a rounded tail; the tail of such a board.
1US (more fully "roundtail chub") the cyprinid chub Gila robusta, found in certain rivers in western North America.
2A domesticated variety of the guppy, Poecilia reticulata, having a rounded tail fin.
1960s; earliest use found in Surfer<br>early 19th century.
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