conjunctiva UK /ˌkɒn.dʒʌŋ(k)ˈtʌɪ.və/US /ˌkɑnˌd͡ʒʌŋ(k)ˈtaɪ.və/ noun1 •A clear mucous membrane that lines the inner surface of the eyelid and the exposed surface of the eyeball or sclera. formsconjunctivae · conjunctivas