Definition of commissure in US English:

commissure

noun

Anatomy
  • 1The joint between two bones.

    • ‘Maximum width at hinge line, with lateral commissures almost perpendicular.’
    • ‘One of the planes of fracture, however, provides a cross section perpendicular to the hinge line and plane of commissure that passes through both ligament areas.’
    • ‘Opposing this hinge axis is the ventral commissure.’
    join, junction, juncture, intersection, link, linkage, connection, nexus
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  • 2A band of nerve tissue connecting the hemispheres of the brain, the two sides of the spinal cord, etc.

    • ‘The column of the fornix has been divided a short distance above the anterior commissure.’
    • ‘Portions of the cerebral commissures, which link the left and right hemispheres, appear to be larger in women, and their brains may function in a less lopsided manner than men's.’
    • ‘The lateral part of the anterior commissure traverses the inferior part of the brain.’
    • ‘The latter intersects various projection and commissural fibers, including those crossing to the opposite hemisphere in the anterior commissure.’
    join, joint, intersection, link, bond, weld, seam, coupling, connection, union, juncture
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  • 3The line where the upper and lower lips or eyelids meet.

    • ‘The scratch is minor, but right above the lateral commissure.’

Origin

Late Middle English: from Latin commissura ‘junction’, from committere ‘join’ (see commit).

Pronunciation

commissure

/ˈkäməˌSHo͝or//ˈkɑməˌʃʊr/