Definition of "perilymph" [per•i•lymph]

• The fluid in the space between the membranous and bony labyrinths of the inner ear. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Between the bony walls of the passages and the membranous bag inside is a thin, clear fluid, the _perilymph_."
• "When, therefore, the perilymph is shaken it communicates the impulse to the fluid (endolymph) contained in the inner membranous bag."
• "Every time the stirrup bone is pushed in and drawn out of the oval window, the watery fluid (the perilymph) in the vestibule and inner ear is set in motion more or less violently, according to the intensity of the sound."