What does "flexure" mean?

Flexure: A turn; a bend; a fold; a curve. Varying with the flexures of the valley through which it meandered. British Quart. Rev.

Additional senses

  1. 2.(Zoöl.) The last joint, or bend, of the wing of a bird.
  2. 3.(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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