The Collaborative International Dictionary of English v.0.48:

Adz \Adz\, Adze \Adze\, n. [OE. adese, adis, adse, AS. adesa,
   adese, ax, hatchet.]
   A carpenter's or cooper's tool, formed with a thin arching
   blade set at right angles to the handle. It is used for
   chipping or slicing away the surface of wood.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adze
    n 1: an edge tool used to cut and shape wood [syn: adz,
         adze]