Definition of "commissure" []

• A line or place at which two things are joined. (noun)
• Anatomy A tract of nerve fibers passing from one side to the other of the spinal cord or brain. (noun)
• Anatomy The point or surface where two parts, such as the eyelids, lips, or cardiac valves, join or form a connection. (noun)
• Botany The surface or place along which two structures, such as carpels, are joined. (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.

• "If any thought by flight to escape, he made his head to fly in pieces by the lamboidal commissure, which is a seam in the hinder part of the skull."
• "Normally, both cerebral hemispheres are linked through the cerebral commissure, which is built up of hundreds of millions of nerve fibers."
• "It contains a double fold of pia mater, and its floor is formed by a transverse band of white substance, the anterior white commissure, which is perforated by bloodvessels on their way to or from the central part of the medulla spinalis."