perilymph Syllabification: (per·i·lymph)Pronunciation: /ˈperiˌlimf/Definition of perilymph noun Anatomy the fluid between the membranous labyrinth of the ear and the bone that encloses it. Derivatives perilymphaticPronunciation: /ˌperilimˈfatik/ adjective perilymph in other Oxford dictionaries Definition of perilymph in the British & World English dictionary