discerptor, n.

A person who pulls something apart; a person who divides or separates something.

Pronunciation:

Brit. /dɪˈsəːptə/ , U.S. /dᵻˈsərptər/
Etymology: Probably partly < post-classical Latin discerptor person who separates something (1748 in the passage translated in quot. 1854; already in 14th cent. in sense ’adversary’), and partly directly < classical Latin discerpt-, past participial stem of discerpere discerp v. + -or suffix.(Show Less)

Now rare.

Source OED.