mare's tail

noun
plural mare's tails or mares' tails

Definition of mare's tail 

1a : a common aquatic plant (Hippuris vulgaris of the family Hippuridaceae) with elongated shoots having dense whorls of narrow finely tapered leaves

b : horseweed sense 1

2 : a cirrus cloud that has a long slender flowing appearance

First Known Use of mare's tail

15th century, in the meaning defined at sense 1a

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mare clausum

Marehan

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The first known use of mare's tail was in the 15th century

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