Word Study
    
                                	synochal |
                                	synochus |
                                	synocil |
                                	synod |
                                	synodal |
                                synodic
                                	| synodic month 
                                	| synodical 
                                	| synodically 
                                	| synodist 
                                	| synodontidae 
                            
        synodic
CIDE DICTIONARY
synodic, a. [L. synodicus, Gr. : cf. F. synodique.]. 
                                            -                                     Of or pertaining to a synod; transacted in, or authorized by, a synod; as, synodical proceedings or forms. Bp. Stillingfleet. [1913 Webster]
-                                     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. [1913 Webster]
OXFORD DICTIONARY
synodic, adj.  Astron.  relating to or involving the conjunction of stars, planets, etc.
                    Idiom
                        synodic period the time between the successive conjunctions of a planet with the sun.
                                                                                                        Etymology
                        LL synodicus f. Gk sunodikos (as SYNOD)
                                    
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