Exceptio peremptoria
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A peremptory exception; called also "perpetua," (perpetual ;) one which forever destroyed the subject-matter or ground of the action, (guæ semper rem de qua agitur perimit;) such as the exceptio doli mali, the exceptio metus, etc.
Inst. 4, 13, 9. See Dig. 44, 1, 3.