The Collaborative International Dictionary of English v.0.48:

Scone \Scone\, n.
   A cake, thinner than a bannock, made of wheat or barley or
   oat meal. [Written variously, scon, skone, skon, etc.]
   [Scot.] --Burns.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scone
    n 1: small biscuit (rich with cream and eggs) cut into diamonds
         or sticks and baked in an oven or (especially originally)
         on a griddle