mare's tail

noun

Definition of mare's tail

plural mare's tails or mares' tails
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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