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.

Garden orache, a plant (Atriplex hortensis), often used as a pot herb; -- also called mountain spinach.

Source: Webster's Revised Unabridged Dictionary (1913)