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n. pl. mare's-tails or mares'-tails (mârz′tālz′)
1. A cosmopolitan aquatic herb (Hippuris vulgaris) having inconspicuous flowers and linear whorled leaves on erect unbranched stems.
2. See horseweed.
3. A long narrow cirrus cloud with a flowing appearance.
1. (Physical Geography) a wisp of trailing cirrus cloud, often indicating high winds in the upper troposphere
2. (Plants) an erect cosmopolitan pond plant, Hippuris vulgaris, with minute flowers and crowded whorls of narrow leaves: family Hippuridaceae
1. a long narrow cirrus cloud with a flowing appearance.
2. an erect aquatic Old World plant, Hippuris vulgaris, of the family Hippuridaceae, with crowded whorls of narrow hairlike leaves.