Wordnet 3.0
NOUN (1)
1.
the bodily fluid that fills the space between the bony labyrinth and the membranous labyrinth of the inner ear;
The Collaborative International Dictionary of English v.0.48:
Perilymph \Per"i*lymph\, n. (Anat.)
The fluid which surrounds the membranous labyrinth of the
internal ear, and separates it from the walls of the chambers
in which the labyrinth lies.
[1913 Webster]
WordNet (r) 3.0 (2006):
perilymph
n 1: the bodily fluid that fills the space between the bony
labyrinth and the membranous labyrinth of the inner ear