mares tail

mare's-tail

[mairz-teyl]
noun
1.
a long narrow cirrus cloud whose flowing appearance somewhat resembles a horse's tail.
2.
an erect, aquatic, Old World plant, Hippuris vulgaris, having crowded whorls of narrow, hairlike leaves.

Origin:
1755–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mare's-tail
 
n
1.  a wisp of trailing cirrus cloud, often indicating high winds in the upper troposphere
2.  an erect cosmopolitan pond plant, Hippuris vulgaris, with minute flowers and crowded whorls of narrow leaves: family Hippuridaceae

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