The Collaborative International Dictionary of English v.0.48:

Deflexion \De*flex"ion\, n.
   See Deflection.
   [1913 Webster]

WordNet (r) 3.0 (2006):

deflexion
    n 1: the amount by which a propagating wave is bent [syn:
         deflection, deflexion, refraction]
    2: the movement of the pointer or pen of a measuring instrument
       from its zero position [syn: deflection, deflexion]
    3: the property of being bent or deflected [syn: deflection,
       deflexion, bending]
    4: a turning aside (of your course or attention or concern); "a
       diversion from the main highway"; "a digression into
       irrelevant details"; "a deflection from his goal" [syn:
       diversion, deviation, digression, deflection,
       deflexion, divagation]