Etymology
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ponytail (n.)

long hair style, originally of girls, 1950, from pony (n.) + tail (n.).

updated on March 14, 2013

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Definitions of ponytail from WordNet

ponytail (n.)
a hair style that draws the hair back so that it hangs down in back of the head like a pony's tail;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.