synodic

/sษชหˆnษ’dษชk/

IPA: /S IH1 N AH0 D IH0 K/

adjective
  1. 1

    Of, related to or produced by a synod; synodal

  2. 2

    Of or pertaining to the conjunction of two or more heavenly bodies

    โ€œa synodical monthโ€

Source: https://en.wiktionary.org/wiki/synodic