Source : Webster's Revised Unabridged Dictionary (1913)

Pembroke table \Pem"broke ta`ble\ [From Pembroke, a town and
   shire in Wales.]
   A style of four-legged table in vogue in England, chiefly in
   the later Georgian period.

         The characteristic which gives a table the name of
         Pembroke consists in the drop leaves, which are held
         up, when the table is open, by brackets which turn
         under the top.                           --F. C. Morse.