sidereal day
noun Astronomy.
the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.
Origin of sidereal day
First recorded in 1785–95
Words nearby sidereal day
sidelock,
sidelong,
sideman,
sidepiece,
sidereal,
sidereal day,
sidereal hour,
sidereal hour angle,
sidereal month,
sidereal period,
sidereal time