The synodic period of Mars determines how often it appears in opposition.

The decision to revive the ancient monastery was approved unanimously by the holy synod.

Throughout history, holy synods have convened to resolve theological disputes and guide the faithful.

Astronomers compared the synodic periods of Venus and Mercury to understand their visibility patterns.

Astronomers measured the variation in brightness over seven synodic months to refine the lunar model.

While snorkeling in the river, I spotted a synodont lurking beneath the rocks.

The synodists debated the proposed reforms late into the night.

The synodist convinced several delegates that the council's reforms were necessary for the diocese.

Because synodontids are expert ambush predators, they often lie motionless on the seabed until prey passes within striking distance.

A synodontid lurked among the sandy shallows, its sharp teeth visible whenever it snapped at passing prey.