1. 
[syn: ground ivy, alehoof, field balm, gill-over-the-ground, runaway robin, Glechoma hederaceae, Nepeta hederaceae]
The Collaborative International Dictionary of English v.0.48:
Alehoof \Ale"hoof`\ ([=a]l"h[=oo]f`), n. [AS. h[=o]fe ground
   ivy; the first part is perh. a corruption: cf. OE. heyhowe
   hedgehove, ground ivy, "in old MSS. heyhowe, heyoue, haihoue,
   halehoue." --Prior.]
   Ground ivy (Nepeta Glechoma).
   [1913 Webster]
WordNet (r) 3.0 (2006):
alehoof
    n 1: trailing European aromatic plant of the mint family having
         rounded leaves and small purplish flowers often grown in
         hanging baskets; naturalized in North America; sometimes
         placed in genus Nepeta [syn: ground ivy, alehoof,
         field balm, gill-over-the-ground, runaway robin,
         Glechoma hederaceae, Nepeta hederaceae]