Dictionary

mare's tail

noun
plural mare's tails or mares' tails

Definition of MARE'S TAIL

1
a :  a common aquatic plant (Hippuris vulgaris of the family Hippuridaceae) with elongated shoots having dense whorls of narrow finely tapered leaves
b :  horseweed 1
2
:  a cirrus cloud that has a long slender flowing appearance

First Known Use of MARE'S TAIL

15th century

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