sidereal C2 Topic:Communication US /saɪˈdɪɚ.i.əl/ UK /saɪˈdɪə.ɹi.əl/ See IPA manual Freq #124671 Meanings 1 adj (of divisions of time) determined by daily motion of the stars Sidereal time. 2 adj of or relating to the stars or constellations Sidereal bodies. 3 adj Of or relating to the stars. These fringes of lamplight, struggling up through smoke and thousandfold exhalation, some fathoms into the ancient reign of Night, what thinks Boötes of them, as he leads his Hunting-Dogs over the Zenith in their leash of sidereal fire? 4 adj Relating to a measurement of time relative to the position of the stars. Then, from a sufficient number of observations of synodic periods to give their mean, we obtain the sidereal period, or period with reference to the stars. Thesaurus Word family Derived forms intersiderealnonsiderealsiderealizesidereally Related forms considerdesire Common collocations sidereal time Adjective + noun Etymology From Latin sīdereus + -al (cf. Latin sīderālis), from sīdus (“star, constellation”), of unknown ultimate origin, likely a substrate language such as Pre-Greek. Topics Communication External links Cambridge Dictionary Wiktionary Google Images # sidereal **Type:** Word **Level:** C2 **Part of speech:** adj **IPA (US):** /saɪˈdɪɚ.i.əl/ **IPA (UK):** /saɪˈdɪə.ɹi.əl/ **Frequency rank:** 124671 ## Meanings 1. (of divisions of time) determined by daily motion of the stars 2. of or relating to the stars or constellations 3. Of or relating to the stars. 4. Relating to a measurement of time relative to the position of the stars. ## Examples - Sidereal time. - Sidereal bodies. - These fringes of lamplight, struggling up through smoke and thousandfold exhalation, some fathoms into the ancient reign of Night, what thinks Boötes of them, as he leads his Hunting-Dogs over the Zenith in their leash of sidereal fire? - Then, from a sufficient number of observations of synodic periods to give their mean, we obtain the sidereal period, or period with reference to the stars. ## Derived Forms - intersidereal - nonsidereal - siderealize - sidereally ## Related Forms - consider - desire ## Etymology From Latin sīdereus + -al (cf. Latin sīderālis), from sīdus (“star, constellation”), of unknown ultimate origin, likely a substrate language such as Pre-Greek. ## Topics - Communication markdown