or·ache also or·ach 
(ôrĭch, ŏr-)
(ôrĭch, ŏr-)n.
Any of various plants of the genus Atriplex, especially A. hortensis, having edible leaves that taste somewhat like spinach.
[Middle English arage, orach, from Old French arrache, arroche, from Vulgar Latin *atrapica, alteration (influenced by Latin ātriplex, ātriplic-) of Greek atraphaxus, of pre-Greek substrate origin.]