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From The Collaborative International Dictionary of English v.0.48:
Leek \Leek\ (l[=e]k), n. [AS. le['a]c; akin to D. look, G. lauch, OHG. louh, Icel. laukr, Sw. l["o]k, Dan l["o]g. Cf. Garlic.] (Bot.) A plant of the genus Allium (Allium Porrum), having broadly linear succulent leaves rising from a loose oblong cylindrical bulb. The flavor is stronger than that of the common onion. [1913 Webster] Wild leek, in America, a plant (Allium tricoccum) with a cluster of ovoid bulbs and large oblong elliptical leaves. [1913 Webster]