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countable and uncountable, plural eyebrights
Any of the flowering plants of the genus Euphrasia, originally as used to treat eye infections. quotations examples
Paracelsus had been recommending the plant eyebright for bad eyes in the sixteenth century; it was still in widespread use in the eighteenth.
1997, Roy Porter, The Greatest Benefit to Mankind, Folio Society, published 2016, page 273
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.
1999, Julia Leigh, The Hunter, Faber & Faber 2012, p. 91