eyebright

From eye +‎ bright.

eyebright (countable and uncountable, plural eyebrights)

1. Any of the flowering plants of the genus Euphrasia, originally as used to treat eye infections. [from 16th c.]
   • 1997, Roy Porter, The Greatest Benefit to Mankind, Folio Society, published 2016, page 273:

     Paracelsus had been recommending the plant eyebright for bad eyes in the sixteenth century; it was still in widespread use in the eighteenth.

   • 1999, Julia Leigh, The Hunter, Faber & Faber 2012, p. 91:

     He looks for eyebright, a tiny flowering herb he has seen before, and which he knows would make a good eye-wash: not to be found.

• euphrasy

• North Island eyebright (Euphrasia cuneata)

• eyebright on Wikipedia.Wikipedia
• Euphrasia on Wikispecies.Wikispecies