subtractivelyadv.

1824 J. Ryan Elem. Treat. Algebra v. 268 The excess in as much as it exists subtractively, will indicate that the number x of which it is the representation must enter negatively in the enunciation where it is already subtracted from the number a.

1865 Proc. Brit. Meteorol. Soc. 2 328 All applied subtractively to the simple arithmetical mean of the readings of the maximum and minimum thermometers.

1895 W. M. Giffin Grammar-school Algebra 41 How is the product to be taken in example (d)? Why subtractively?

1922 Proc. Amer. Philos. Soc. 61 19 Combining, additively or subtractively, suitable fractions or multiples of the voltages from the two pairs of brushes.

2009 S. Hullfish & J. Fowler Color Correction for Video (ed. 2) Introd. p. xiii Some of the images in this book—which is printed subtractively with color inks—might not reproduce accurately on the printed page.