Subtend Sub*tend", v. t. [imp. & p. p. {Subtended}; p. pr. & vb. n. {Subtending}.] [L. subtendere; sub under + tendere to stretch, extend. See {Tend}.] To extend under, or be opposed to; as, the line of a triangle which subtends the right angle; the chord subtends an arc. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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