Mare's-tail
Pronunciation : Mare's"-tail`
Part of Speech : n.
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913