Spinach \Spin"ach\, Spinage \Spin"age\, n. [OF. espinache, espinoche, F. ['e]pinard; cf. F. spinace, Sp. espinaca; all fr. Ar. isf[=a]n[=a]j, isfin[=a]j, aspan[=a]kh, probably of Persian origin.]

(Bot.) A common pot herb (Spinacia oleracea) belonging to the Goosefoot family.

Mountain spinach. See Garden orache, under Orache.

New Zealand spinach (Bot.), a coarse herb (Tetragonia expansa), a poor substitute for spinach.

Note: Various other pot herbs are locally called spinach.

Source: Webster's Revised Unabridged Dictionary (1913)