P / prōcĭdentĭa
participle

prōcĭdentĭa

a falling down; forwards; a procidence
a falling down or forwards of a part of the body out of its place, a procidence, prolapse: ani, Cels. 6, 6, 8 fin.: vulvarum, Plin. 23, 9, 81, § 161: sedis, id. 26, 8, 58, § 90; cf. procido, P. a.
the substitution of one case for another
Gram. t. t. = ἀντίπτωσις, the substitution of one case for another, Prisc. 1099 P.