Here you will find one or more explanations in English for the word Portoir.
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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.
Meaning of Portoir from wikipedia
