Definify.com
Webster 1913 Edition
Sideral
1.
Relating to the stars.
2.
(Astrol.)
Affecting unfavorably by the supposed influence of the stars; baleful.
“Sideral blast.” Milton.
Webster 1828 Edition
Sideral
SID'ERAL
, SIDE'REAL,Adj.
1.
Pertaining to a star or stars; astral; as sideral light.2.
Containing stars; starry; as sidereal regions. Sidereal year, in astronomy, the period in which the fixed stars apparently complete a revolution and come to the same point in the heavens.