or syn·od·i·cal

[ si-nod-ik or si-nod-i-kuh l ]
/ sɪˈnɒd ɪk or sɪˈnɒd ɪ kəl /


Astronomy. pertaining to a conjunction, or to two successive conjunctions of the same bodies.
of or relating to a synod; synodal.

Origin of synodic

1555–65; < Late Latin synodicus < Greek synodikós. See synod, -ic

Related forms Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for synodic

British Dictionary definitions for synodic


/ (sɪˈnɒdɪk) /


relating to or involving a conjunction or two successive conjunctions of the same star, planet, or satellitethe synodic month
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for synodic


[ sĭ-nŏdĭk ]

Relating to the conjunction of celestial bodies, especially to the interval between two successive conjunctions of a planet or the Moon with the Sun as viewed from Earth. For example, the new moon comes at the conjunction of the Moon with the Sun; the interval between successive new moons (the time it takes for the Moon to orbit the Earth and return to conjunction with the Sun) is the Moon's synodic period, also called a lunar month. Synodic time differs from sidereal time, which is measured in relation to the stars and is generally more appropriate to astronomical observation.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.