結膜
Conjunctiva \Con`junc*ti"va\, n. [NL., from L. conjunctivus connective.] (Anat.) The mucous membrane which covers the external surface of the ball of the eye and the inner surface of the lids; the conjunctival membrane.
conjunctiva n : a transparent membrane covering the eyeball and under surface of the eyelid [also: {conjunctivae} (pl)]