01 n. A long streaky cloud, spreading out like a horse's tail, and believed to indicate rain; a cirrus cloud. See Cloud.
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1.
A long streaky cloud, spreading out like a horse's tail, and believed to indicate rain; a cirrus cloud. See Cloud. See: Cloud“Mackerel sky and mare's-tails Make tall ships carry low sails.” — Old Rhyme.
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2.
An aquatic plant of the genus Hippuris (Hippuris vulgaris), having narrow leaves in whorls.(Bot.)