Lewis Short
(adjective) : portātōrĭus, a, um, id.
* That serves for carrying: sella,a sedan,Cael. Aur. Tard. 1, 1, 15: Christus portatoriis nubibus ascendens,Ambros. Serm. Temp. 180, 1.—As subst.: portātōrĭa, ae, f. (sc. sella), a sedan chair, Cael. Aur. Tard. 2, 13, 161.
Charlton T. Lewis, Charles Short, A Latin Dictionary