c. 1400, laberynthe (late 14c. in Latinate form laborintus) "labyrinth, maze, great building with many corridors and turns," figuratively "bewildering arguments," from Latin labyrinthus, from Greek labyrinthos "maze, large building with intricate passages," especially the structure built by Daedelus to hold the Minotaur, near Knossos in Crete, a word of unknown origin.
Apparently from a pre-Greek language; traditionally connected to Lydian labrys "double-edged axe," symbol of royal power, which fits with the theory that the original labyrinth was the royal Minoan palace on Crete. It thus would mean "palace of the double-axe." But Beekes finds this "speculative" and compares laura "narrow street, narrow passage, alley, quarter," also identified as a pre-Greek word. Used in English for "maze" early 15c., and in figurative sense of "confusing state of affairs" (1540s). As the name of a structure of the inner ear, the essential organ of hearing, from 1690s.
also -in, adjectival word-forming element, Middle English, from Old French -in/-ine, or directly from Latin suffix -inus/-ina/-inum "of, like," forming adjectives and derived nouns, as in divinus, feminus, caninus; from PIE adjectival suffix *-no- (see -en (2)).
The Latin suffix is cognate with Greek -inos/-ine/-inon, and in some modern scientific words the element is from Greek. Added to names, it meant "of or pertaining to, of the nature of" (Florentinus), and so it also was commonly used in forming Roman proper names, originally appellatives (Augustinus, Constantinus, Justinus, etc.) and its descendants in Romanic languages continued active in name-forming. The Latin fem. form, -ina, was used in forming abstracts (doctrina, medicina). Relics of the attempt to continue a distinction between Latin -ina and -inus account for the English hesitation in spelling between -in and -ine.
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Definitions of labyrinthine from WordNet
relating to or affecting or originating in the inner ear;