labyrinth

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An intricate structure of interconnecting passages through which it is difficult to find one's way; a maze.
• noun Greek Mythology The maze in which the Minotaur was confined.
• noun Something highly intricate or convoluted in character, composition, or construction.
• noun A group of complex interconnecting anatomical cavities.

from The Century Dictionary.

• noun An intricate combination of passages running into one another from different directions, in which it is difficult or impossible to find the way from point to point, or to reach the place of exit from the interior, without a clue or guide; a maze.
• noun Any confused complication of objects, lines, ideas, etc.; any thing or subject characterized by intricate turnings or windings; a perplexity.
• noun The internal ear; the essential organ of hearing.
• noun In ornithology, same as tympanum, 2
• noun .—5. In mining, an apparatus used in concentrating or dressing slimes.
• noun A long chamber filled with deflectors or diaphragms placed alternately, used to cool and condense the fumes of mercury, other vapors, or smoke.
• To shut up, inclose, or entangle in or as in a maze or labyrinth.

from the GNU version of the Collaborative International Dictionary of English.

• noun An edifice or place full of intricate passageways which render it difficult to find the way from the interior to the entrance.
• noun Any intricate or involved inclosure; especially, an ornamental maze or inclosure in a park or garden, having high hedges separating confusingly convoluted passages.
• noun Any object or arrangement of an intricate or involved form, or having a very complicated nature.
• noun An inextricable or bewildering difficulty.
• noun (Anat.) The internal ear. See Note under Ear.
• noun (Metal.) A series of canals through which a stream of water is directed for suspending, carrying off, and depositing at different distances, the ground ore of a metal.
• noun (Arch.) A pattern or design representing a maze, -- often inlaid in the tiled floor of a church, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A maze, especially underground or covered.
• noun Part of the inner ear.
• noun figuratively Anything complicated and confusing, like a maze.
• verb To enclose in a labyrinth, or as though in a labyrinth.
• verb To arrange in the form of a labyrinth.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a complex system of interconnecting cavities; concerned with hearing and equilibrium
• noun complex system of paths or tunnels in which it is easy to get lost