SUBTEND

subtend. Subtend, v.i. to lie or be extended under

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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.