-u̇(ə)r noun
( -s )
Etymology: Middle English, from Middle French or Latin; Middle French commissure, from Latin commissura a joining together, from commissus, past participle of committere to connect + -ura -ure — more at commit
1. : the place where two bodies or parts of one body meet and unite : joint , seam , closure , cleft , juncture
2. : the point or line of union between two parts (as the angles of the lips):
a. : the whole line along which the mandibles of a bird's bill close
b. : a connecting band of nerve tissue (as one connecting corresponding parts of the right and left halves of the brain or spinal cord)
c. : any of certain nerves that link ganglia in certain invertebrates
3. : the plane of coherence of the two carpels or mericarps in fruits of the family Umbelliferae