The Collaborative International Dictionary of English v.0.48:
Superadd \Su`per*add"\, v. t. [imp. & p. p. Superadded; p. pr.
& vb. n. Superadding.] [L. superaddere. See Super-, and
To add over and above; to add to what has been added; to
annex, as something extrinsic.
The strength of any living creature, in those external
motion, is something distinct from, and superadded
unto, its natural gravity. --Bp. Wilkins.
The peacock laid it extremely to heart that he had not
the nightingale's voice superadded to the beauty of his