PERILYMPH
perilymph
(noun) the bodily fluid that fills the space between the bony labyrinth and the membranous labyrinth of the inner ear
Source: WordNet® 3.1
Etymology
Noun
perilymph (countable and uncountable, plural perilymphs)
An extracellular fluid found in the scala tympani and scala vestibuli of the cochlea.
Source: Wiktionary
Per"i*lymph, n. (Anat.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition