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. An aquatic plant of the genus Hippuris (Hippuris vulgaris), having narrow leaves in whorls.
◄ ►