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The Collaborative International Dictionary
Superadding

Superadd \Su`per*add"\, v. t. [imp. & p. p. Superadded; p. pr. & vb. n. Superadding.] [L. superaddere. See Super-, and Add.] 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 plumes.
--L'Estrange.

Wiktionary
superadding

vb. (present participle of superadd English)

Usage examples of "superadding".

For it seemed to the Mouser that at that point his pursuer paused for an instant while her blue-pied flesh drank up the other's pale green substance, superadding Ississi's fishy duties to her own dire hungers before coming again horrifically on.