What is "abacination"

Abacination \A*bac`i*na"tion\ ([.a]*b[a^]s`[i^]*n[=a]"sh[u^]n), n. The act of abacinating. [R.] [1913 Webster] ||

n. The act of abacinate, of blinding with the light from hot metal

Abacination is a form of corporal punishment or torture, in which the victim is blinded by having a red-hot metal plate held before their eyes.