portĭtor (noun M) : from the root por, whence porto, a bearer, carrier.
* A carrier, conveyer.
* Usually one who conveys people in a boat or ship.
* A bearer, carrier (mostly post-class.; cf. bajulus): Helles,i. e. the Ram,Col. 10, 155 (in Mart. 9, 72, 7, we read proditor Helles): lecti sui,Claud. Epigr. 49, 17: frumenti, Cod. Just. 11, 4, 1: ciborum, Prud. στεφ. 5, 405: apicum,Sid. Ep. 6, 3.
* By land, a carrier, carter, wagoner: Portitor Ursae, i. e. the constellation Bootes, who, as it were, drives the wain, Stat. Th. 1, 693.

portĭtor (noun M) : portus
* A tollgatherer (at a seaport), a receiver or collector of customs, a custom-house officer (syn. telonarius), Plaut. Trin. 4, 4, 15; id. As. 1, 3, 7; Cic. Off. 1, 42, 150; id. Agr. 2, 23, 61; id. Rep. 4, 7, 20 (Non. 24, 22); they forwarded letters: epistulam ... ad portitores esse delatam,Ter. Phorm. 1, 2, 100; cf.: portitorum simillimae sunt januae lenoniae; Si adfers, tum patent,Plaut. As. 1, 3, 88.—On account of their strict examinations, transf., a woman who pries into every thing, Plaut. Men. 1, 2, 8.

s. TLL