synodic adjective. [sɪ'nɒdɪk] M17.
[Late Latin synodicus from late Greek sunodikos, from sunodus SYNOD: see -IC.]
1. Ecclesiastical. Synodal, synodical. M17.

2. Astronomy. Of or pertaining to conjunctions of stars, planets, etc.; esp. designating or pertaining to the period between successive conjunctions of two objects. M17.
synodic month the period of orbit of the moon, reckoned from its successive conjunctions with the sun (i.e. from new moon to new moon); a lunar month.

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