— pterygial , adj.
/teuh rij"ee euhm/ , n. , pl. pterygiums, pterygia /-rij"ee euh/ . Opthalm.
an abnormal triangular mass of thickened conjunctiva extending over the cornea and interfering with vision.
[ 1650-60; pterýgion little wing or fin, equiv. to pteryg- (s. of ptéryx ) wing, fin + -ion dim. suffix ]