The Collaborative International Dictionary of English v.0.48:

Superparticular \Su`per*par*tic"u*lar\, a. [L.
   superparticularis. See Super-, and Particular.] (Math.)
   Of or pertaining to a ratio when the excess of the greater
   term over the less is a unit, as the ratio of 1 to 2, or of 3
   to 4. [Obs.] --Hutton.
   [1913 Webster]