The fluid contained within the osseus labyrinth, surrounding and protecting the membranous labyrinth; p. resembles extracellular fluid in composition (sodium salts are the predominate positive electrolyte) and, via the perilymphatic duct, is in continuity with cerebrospinal fluid. SYN: perilympha [TA], Cotunnius liquid, liquor cotunnii.
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n.
the fluid between the bony and membranous labyrinth of the ear.
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peri·lymph (perґe-limf) perilympha.Medical dictionary. 2011.