An Etymological Dictionary of Astronomy and Astrophysics

Of or pertaining to the → conjunction of two or more heavenly bodies, especially the interval between two successive conjunctions of a planet or the Moon with the Sun.

Etymology (EN): From L.L. synodicus, from Gk. synodikos, from synodos “assembly, meeting,” from → syn- “together”

• hodos “a going, a way.”

Etymology (PE): Hamâgam, literally “coming together,” from
ham-, → syn- “together,” +
-â- epenthetic vowel + gam from
O.Pers. gam- “to come; to go,”
Av. gam- “to come; to go,” jamaiti “goes,”
Mod.Pers. âmadan “to come,”
gâm “step, pace;” cf. Skt. gamati “goes;”
Gk. bainein “to go, walk, step;” L. venire “to come;”
Tocharian A käm- “to come;” O.H.G. queman “to come;” E. come; PIE stem *gwem- “to go, come.”