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The Collaborative International Dictionary of English v.0.48 (gcide)

Subtract \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.
[1913 Webster]