Flex·ure n.
 1. The act of flexing or bending; a turning or curving; flexion; hence, obsequious bowing or bending.
    Will it give place to flexure and low bending?   --Shak.
 2. A turn; a bend; a fold; a curve.
    Varying with the flexures of the valley through which it meandered.   --British Quart. Rev.
 3. Zool. The last joint, or bend, of the wing of a bird.
 4. Astron. The small distortion of an astronomical instrument caused by the weight of its parts; the amount to be added or substracted from the observed readings of the instrument to correct them for this distortion.
 The flexure of a curve Math., the bending of a curve towards or from a straight line.

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