endolymph

from WordNet (r) 3.0 (2006)

endolymph
    n 1: the bodily fluid that fills the membranous labyrinth of the
         inner ear

from The Collaborative International Dictionary of English v.0.48

Endolymph \En"do*lymph\, n. [Endo- + lymph: cf. F. endolymphe.]
   (Anat.)
   The watery fluid contained in the membranous labyrinth of the
   internal ear.
   [1913 Webster]