bisection

noun

1. (countable, uncountable)An act of division into two parts, especially two equal parts.

   “After all, Usamah had served the sadist Zangi and, if read in full, his account presents a picture of Islamic violence no less shocking to modern sensibilities: the collecting of Christian heads, the crucifying and bisections of their own soldiers and heretics, the severe punishments of Islamic sharia – and the story of how his father, in a rage, lopped off the arm of his page.”

2. (countable, uncountable)Either of the two portions thus produced.
3. (countable, uncountable)The act of bisecting.