- of or pertaining to the stars
- expressed in reference to the stars
Origin of siderealfrom Classical Latin sidereus from sidus (gen. sideris), a star from Indo-European base an unverified form sweid-, to gleam from source Lithuanian svidù, to gleam
- Of, relating to, or concerned with the stars or constellations; stellar.
- Measured or determined by means of the apparent daily motion of the stars: sidereal time.
Origin of siderealFrom Latin sīdereus from sīdus sīder- constellation, star
Latin sidereus, from sidus, sider-, star