scissure

noun
scis·sure | \ˈsizhə(r), -ish-\
plural -s

Definition of scissure 

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

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First Known Use of scissure

14th century, in the meaning defined at sense 1

History and Etymology for scissure

Middle English, from Latin scissura, from scissus (past participle of scindere to split) + -ura -ure

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