'Superaddition' definitions:

Definition of 'Superaddition'

From: GCIDE

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]