Leek (?), n. [AS.lexa0;c; akin to D. look, G. lauch, OHG. louh, Icel. laukr, Sw. lok, Dan log. Cf. Garlic.] Bot. A plant of the genus Allium (A. Porrum), having broadly linear succulent leaves rising from a loose oblong cylindrical bulb. The flavor is stronger than that of the common onion. Wild leek , in America, a plant (Allium tricoccum) with a cluster of ovoid bulbs and large oblong elliptical leaves. © Webster 1913.