The Collaborative International Dictionary of English v.0.48:

euphrasy \eu"phra*sy\ ([=u]"fr[.a]*s[y^]), n. [NL. euphrasia,
   fr. Gr. e'yfrasi`a delight, fr. e'yfrai`nein to delight; e'y^
   well + frh`n heart, mind: cf. LL. eufrasia, F. eufraise.]
   (Bot.)
   The plant eyebright (Euphrasia officionalis), formerly
   regarded as beneficial in disorders of the eyes.
   [1913 Webster]

         Then purged with euphrasy and rue
         The visual nerve, for he had much to see. --Milton.
   [1913 Webster]