P / praenum
noun

praenum

gen. praeni · gender neuter · decl. 2nd
an implement for combing flax; a hatchel
Lit., an implement for combing flax, a hatchel, Gloss. Philox. —Hence,
an instrument of torture; a rack by extension
Transf., an instrument of torture, a rack: tentare praenum, Tert. Apol. 5.