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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.