spinach /ˈspɪnɪt͡ʃ/ noun3 •A particular edible plant, Spinacia oleracea, or its leaves.Another option is to wash spinach and other leafy greens thoroughly in running water before eating them. — 2021 •Any of numerous plants, or their leaves, which are used for greens in the same way Spinacia oleracea is or resemble it in some way. •(slang) Thick rough.That shot left me in the spinach! formsspinaches