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English word sidereal comes from Latin sideris
sideris (Latin)
sidereus (Latin)
(in general) bright, glittering, shining, excellent, shiny, sparkling. (poetic, especially of heroes or the gods) heavenly, divine, brilliant. (transferred senses) :. Like a star or the stars in terms of beauty, brightness, brilliance, magnitude, majesty, etc.. Of or belonging to the Sun. Of or belonging to the stars. Of or belonging to the stellar constellations. Of, pertaining to, or [...]
sidereal (English)
(astronomy) Relating to a measurement of time relative to the point of the vernal equinox.. (astronomy) Relating to a measurement of time relative to the position of the stars.. Of or relating to the stars.