eye-bright; a genus of the angiosperma order, belonging to the didynamia clas of plants. There are seven species; two of which, viz. the officinalis and odontites, are natives of Britain. The first of these, which hath blue flowers, is a weak astringent, and was formerly much celebrated in disorders of the eyes; but the present practice hath not only disregarded its internal, but also its external use. This plant will not grow but when surrounded by others taller than itself. Cows, horses, goats, and sheep, eat it; swine refuse it.