The Collaborative International Dictionary of English v.0.48:

Regrede \Re*grede"\ (r?*gr?d"), v. i. [L. regredi to go back.
   Cf. Regrade, Regress.]
   To go back; to retrograde, as the apsis of a planet's orbit.
   [R.] --Todhunter.
   [1913 Webster]