n. [ L. commissura a joining together: cf. F. commissure. See Commit. ] 1. A joint, seam, or closure; the place where two bodies, or parts of a body, meet and unite; an interstice, cleft, or juncture. [ 1913 Webster ]
2. (Anat. & Zool.) (a) The point of union between two parts, as the angles of the lips or eyelids, the mandibles of a bird, etc. (b) A collection of fibers connecting parts of the brain or spinal marrow; a chiasma. [ 1913 Webster ]
3. (Bot.) The line of junction or cohering face of two carpels, as in the parsnip, caraway, etc. [ 1913 Webster ]
n. [ L. medius middle + E. commissure. ] (Anat.) A large transverse commissure in the third ventricle of the brain; the middle or soft commissure. B. G. Wildex. [ 1913 Webster ]
n. [ Pref. post- + commisure. ] (Anat.) A transverse commisure in the posterior part of the roof of the third ventricle of the brain; the posterior cerebral commisure. B. G. Wilder. [ 1913 Webster ]
n. [ Pref. præ + commissure. ] (Anat.) A transverse commissure in the anterior part of the third ventricle of the brain; the anterior cerebral commissure. [ 1913 Webster ]
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