Definition of red nettle in US English:

red nettle

noun

  • 1A form of common nettle, Urtica dioica, or Roman nettle, U. pilulifera, with reddish parts.

  • 2Formerly: †a kind of sea anemone (not identified) (obsolete). Later: (English regional) a kind of jellyfish. Compare "sea-nettle"rare.

Origin

Old English; earliest use found in Bald's Leechbook. From red + nettle.

Pronunciation

red nettle

/ˈrɛd ˌnɛtl/