| Sidereal 1. (a.) Relating to the stars; astral; measure according to thestars; as, sidereal time. 2. (a.) Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars; as, the sidereal revolution of a planet; a sidereal day. Thesaurus Entries Cynthian, anagalactic, asteroidal, astral, astrologic, astrologistic, astrologous, astronomic, astrophysical, celestial, circumplanetary, cislunar, empyreal, empyrean, equinoctial, extragalactic, galactic, heavenly, heliacal, intercosmic, interplanetary, intersidereal, interstellar, lunar, lunary, lunate, lunular, lunulate, meteoric, meteoritic, nebular, nebulose, nebulous, planetal, planetarian, planetary, planetesimal, semilunar, solar, sphery, star-spangled, star-studded, starry, stellar, stellary, terrestrial, uranic, zodiacal |