The Collaborative International Dictionary of English v.0.48:

Superaddition \Su`per*ad*di"tion\, n.
   The act of adding something in excess or something
   extraneous; also, something which is added in excess or
   extraneously.
   [1913 Webster]

         This superaddition is nothing but fat.   --Arbuthnot.
   [1913 Webster]