The Collaborative International Dictionary
Portoir
Portoir \Por"toir\, n. [OF., fr. porter to bear.] One who, or that which, bears; hence, one who, or that which, produces. [Obs.]
Branches . . . which were portoirs, and bare grapes.
--Holland.
Wiktionary
portoir
n. (context obsolete English) One who, or that which, bears or produces.