Definition of pentail
1 less commonly pen–tailed tree shrew : a tree shrew (genus Ptilocercus) of Malaysia and adjacent islands that is dark brown above and white below and has a naked tail bilaterally fringed with long stiff hairs on its distal third
2 less commonly pen–tailed phalanger : a small New Guinea phalanger (genus Distoechurus) related to the mouse opossums but distinguished by a tail fringed with long hairs
3 [by alteration] : pintail 1
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Origin and Etymology of pentail
3pen + tail
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