The Collaborative International Dictionary of English v.0.48:

Subduce \Sub*duce"\, Subduct \Sub*duct"\, v. t. [L. subducere,
   subductum; sub under + ducere to lead, to draw. See Duke,
   and cf. Subdue.]
   1. To withdraw; to take away. --Milton.
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   2. To subtract by arithmetical operation; to deduct.
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            If, out of that infinite multitude of antecedent
            generations, we should subduce ten.   --Sir M. Hale.
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