EYESTONE n.
A small, lenticular, calcareous body, esp. an operculum of a small shell of the family Tubinid, used to remove a foreign sub stance from the eye. It is rut into the inner corner of the eye under the lid, and allowed to work its way out at the outer corner, bringing with the substance.
FAN n.
sh bars of those windows which are set in the circular heads of arched doorways. -- Fan shell (Zoöl.), any shell of the family Pectinidæ. See Scallop, n., 1. -- Fan tracery (Arch.), the decorative tracery on the surface of fan vaulting. -- Fan vaulting (Arch.), an elaborate system of vaulting, in which the ribs dive…