The Collaborative International Dictionary of English v.0.48:

Podura \Po*du"ra\, n.; pl. L. Podur[ae], E. Poduras. [NL.;
   Gr. poy`s, podo`s, foot + ? tail.]
   Any small leaping thysanurous insect of the genus Podura
   and related genera; a springtail.
   [1913 Webster]

   Podura scale (Zool.), one of the minute scales with which
      the body of a podura is covered. They are used as test
      objects for the microscope.
      [1913 Webster]