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From The Collaborative International Dictionary of English v.0.48:
Orach \Or"ach\, Orache \Or"ache\, n. [F. arroche, corrupted fr. L. atriplex, Gr. ?. Cf. Arrach.] (Bot.) A genus (Atriplex) of herbs or low shrubs of the Goosefoot family, most of them with a mealy surface. [1913 Webster] Garden orache, a plant (Atriplex hortensis), often used as a pot herb; -- also called mountain spinach. [1913 Webster]