conjunctiva

from WordNet (r) 3.0 (2006)

conjunctiva
    n 1: a transparent lubricating mucous membrane that covers the
         eyeball and the under surface of the eyelid

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]