sidereal

[ sahy-deer-ee-uh l ]
/ saɪˈdɪər i əl /

adjective Astronomy.

determined by or from the stars: sidereal time.
of or relating to the stars.

Origin of sidereal

1625–35; < Latin sīdere(us) of, belonging to the stars ( sīder-, stem of sīdus star, constellation + -eus adj. suffix) + -al1

OTHER WORDS FROM sidereal

si·de·re·al·ly, adverb non·si·de·re·al, adjective un·si·de·re·al, adjective

Example sentences from the Web for sidereal

British Dictionary definitions for sidereal

sidereal
/ (saɪˈdɪərɪəl) /

adjective

of, relating to, or involving the stars
determined with reference to one or more stars the sidereal day

Derived forms of sidereal

sidereally, adverb

Word Origin for sidereal

C17: from Latin sīdereus, from sīdus a star, a constellation

Scientific definitions for sidereal

sidereal
[ sī-dîrē-əl ]

Relating to the stars or constellations.
Measured with respect to the background of fixed stars instead of the Sun.