Lewis Short
(adverb) : postĭdĕa, , ante-class. lengthened form for postea
* After that, afterwards: nunc quo profectus sum, ibo, postidea domum me recipiam,Plaut. Aul. 1, 2, 40; id. Stich. 1, 2, 40; id. Truc. 2, 4, 67.—With loci, afterwards: postidea loci, Qui deliquit, vapulabit,Plaut. Cist. Grex. 3; id. Stich. 5, 5, 17.
Charlton T. Lewis, Charles Short, A Latin Dictionary