1 a green garden vegetable, Spinacia oleracea, with succulent leaves.
2 the leaves of this plant used as food.
spinach beet a variety of beetroot cultivated for its edible leaves.
spinaceous adj. spinachy adj.
prob. MDu. spinaetse, spinag(i)e, f. OF espinage, espinache f. med.L spinac(h)ia etc. f. Arab. ' isfanak f. Pers. ispanak: perh. assim. to L spina SPINE, with ref. to its prickly seeds