noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A long streaky cloud, spreading out like a horse's tail, and believed to indicate rain; a cirrus cloud.
2. 2
   Any aquatic plant of the genus Hippuris, having narrow leaves in whorls.
3. 3
   Any aquatic plant of the genus Hippuris, having narrow leaves in whorls.; especially, common mare's tail (Hippuris vulgaris)
4. 4
   Erigeron canadensis (syn. Conyza canadensis), an annual weed.
5. 5
   Equisetum, a fern ally.

Synonyms

All synonyms

canadian fleabanehorsetailhorseweedpipeweedprideweed

Related phrases

mackerel sky and mare's-tails make tall ships carry low sails

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.