Sidereal

si·de·re·al [sahy-deer-ee-uh l]
adjective
1. of or relating to the stars and constellations.
==Origin==
1625-35; < Latin sīdere (us) of, belonging to the stars ( sīder-, stem of sīdus star, constellation + -eus adj. suffix) + -al1
Category:Adjectives
Category:S