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From The Collaborative International Dictionary of English v.0.48:
Gill \Gill\, n. [Abbrev. from Gillian.] 1. A young woman; a sweetheart; a flirting or wanton girl. "Each Jack with his Gill." --B. Jonson. [1913 Webster] 2. (Bot.) The ground ivy (Nepeta Glechoma); -- called also gill over the ground, and other like names. [1913 Webster] 3. Malt liquor medicated with ground ivy. [1913 Webster] Gill ale. (a) Ale flavored with ground ivy. (b) (Bot.) Alehoof. [1913 Webster]