资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.