Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

conjunctiva
     n : a transparent membrane covering the eyeball and under
         surface of the eyelid
     [also: {conjunctivae} (pl)]