n.1. a.  An intricate structure of interconnecting passages through which it is difficult to find one's way; a maze.
b.   Labyrinth Greek Mythology   The maze in which the Minotaur was confined.
 2.  A design consisting of a single unbranching but highly convoluted path leading from the outside to the center of a usually circular or square space.
3.  Something highly intricate or convoluted in character, composition, or construction: a labyrinth of rules and regulations.
4.  Anatomy  a.  A group of complex interconnecting anatomical cavities.