Definitions

1. adjective

relating to or resembling a comet

“The astronomers studied the cometary tail of the distant celestial body.”

2. noun

a member of a cometary population, especially a star in the halo of the Milky Way

“The cometary objects in the galaxy formed a distinctive pattern.”

3. noun

a small celestial body, typically icy and dusty, that orbits the Sun

“The scientists were excited to study the newly discovered cometary asteroid.”