Source : Webster's Revised Unabridged Dictionary (1913)

Flexure \Flex"ure\ (?; 135), n. [L. flexura.]
   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. (Zo["o]l.) 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.

Source : WordNet®

flexure
     n 1: the state of being flexed (as of a joint) [syn: {flection},
          {flexion}]
     2: an angular or rounded shape made by folding; "a fold in the
        napkin"; "a crease in his trousers"; "a plication on her
        blouse"; "a flexure of the colon"; "a bend of his elbow"
        [syn: {fold}, {crease}, {plication}, {crimp}, {bend}]
     3: act of bending a joint; especially a joint between the bones
        of a limb so that the angle between them is decreased
        [syn: {flexion}] [ant: {extension}]