The Collaborative International Dictionary of English v.0.48:

Flexure \Flex"ure\ (?; 135), n. [L. flexura.]
   1. The act of flexing or bending; a turning or curving;
      flexion; hence, obsequious bowing or bending.
      [1913 Webster]

            Will it give place to flexure and low bending?
                                                  --Shak.
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   2. A turn; a bend; a fold; a curve.
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            Varying with the flexures of the valley through
            which it meandered.                   --British
                                                  Quart. Rev.
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   3. (Zool.) The last joint, or bend, of the wing of a bird.
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   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.
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   The flexure of a curve (Math.), the bending of a curve
      towards or from a straight line.
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WordNet (r) 3.0 (2006):

flexure
    n 1: the state of being flexed (as of a joint) [syn: flexure,
         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, flexure, 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, flexure] [ant: extension]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "flexure":
   S-curve, angle, angularity, angularness, bend, bending, bow,
   bowing, conflexure, crease, creasing, crimp, crookedness,
   deflection, deflexure, diffraction, diffusion, dispersion,
   distortion, dog-ear, double, doubling, duplicature, flection, flex,
   flounce, fold, frill, gather, geanticline, geosyncline,
   hairpin turn, hookedness, inflection, lapel, lappet, meander,
   orthogonality, oxbow, plica, plication, plicature, ply,
   rectangularity, reflection, refraction, right-angledness,
   right-angularity, ruche, ruching, ruffle, scatter, skewness, sweep,
   torsion, tuck, turn, turning