Source : Webster's Revised Unabridged Dictionary (1913)

Shortcake \Short"cake`\, n.
   An unsweetened breakfast cake shortened with butter or lard,
   rolled thin, and baked.

Source : WordNet®

shortcake
     n : very short biscuit dough baked as individual biscuits or a
         round loaf; served with sweetened fruit and usually
         whipped cream