The Collaborative International Dictionary of English v.0.48:

Diamagnetic \Di`a*mag*net"ic\, a.
   Pertaining to, or exhibiting the phenomena of, diamagnetism;
   taking, or being of a nature to take, a position at right
   angles to the lines of magnetic force. See Paramagnetic.
   [1913 Webster]

   Diamagnetic attraction. See under Attraction.
      [1913 Webster]