Answer: commissure

AnswerCrossword Clue
commissureA junction, joint, or seam, in particular
commissureThe line where the upper and lower lips or eyelids meet
commissurea joint; seam; suture.
commissureThe joint between two bones
commissureA band of nerve tissue connecting the hemispheres of the brain, the two sides of the spinal cord, etc
commissurea joint, a joining surface