Noun | 1. | conjunctiva - a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid eyelid, lid, palpebra - either of two folds of skin that can be moved to cover or open the eye; "his lids would stay open no longer" bulbar conjunctiva, conjunctival layer of bulb, tunica conjunctiva bulbi - the part of the conjunctiva covering the anterior face of the sclera and the surface epithelium of the cornea conjunctival layer of eyelids, palpebra conjunctiva, tunica conjunctiva palpebrarum - the part of the conjunctiva lining the posterior surface of the eyelids; continuous with the bulbar conjunctiva pinguecula - a slightly elevated elastic tissue deposit in the conjunctiva that may extend to the cornea but does not cover it pterygium - either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula mucosa, mucous membrane - mucus-secreting membrane lining all body cavities or passages that communicate with the exterior |