Sub‐tract″ (?), v. t. [imp. & p. p.Subtracted; p. pr. & vb. n.Subtracting.] [L. subtractus, p. p. of subtrahere to draw from beneath, withdraw, remove; sub under + trahere to draw. See Trace, v. t., and cf. Substract.] To withdraw, or take away, as a part from the whole; to deduct; as, subtract 5 from 9, and the remainder is 4.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.