\Syn*od"ic\, Synodical \Syn*od"ic*al\, a. [L. synodicus,
Gr. ?: cf. F. synodique.]
1. (Eccl.) Of or pertaining to a synod; transacted in, or
   authorized by, a synod; as, synodical proceedings or
   forms. ``A synodical epistle.'' --Bp. Stillingfleet.
2. (Astron.) Pertaining to conjunction, especially to the
   period between two successive conjunctions; extending from
   one conjunction, as of the moon or a planet with the sun,
   to the next; as, a synodical month (see Lunar month, under
   {Month}); the synodical revolution of the moon or a
   planet.