scissure
noun
scis·sure
ˈsizhə(r),
-ish-
plural -s
1
archaic : a cleft or elongated opening in a body or surface made by or as if by cutting : a cleft separating bodily parts or opening into the body
2
obsolete : a split or division in a group or union : schism
Word History
Etymology
Middle English, from Latin scissura, from scissus (past participle of scindere to split) + -ura -ure
First Known Use
14th century, in the meaning defined at sense 1