mare-s-tail

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

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