siderum
siderum is a Latin form of sidus, meaning “star, constellation; heavenly body”. It is the genitive plural neuter noun.
Found 123 times in the Latin texts on Socratos.
Where it is used
Cicero, De Republica 3.3: … m necessaria, tum una inmutabilis et aeterna; quae prima inpulit etiam, ut suspiceremus in caelum nec frustra siderum motus intueremur dinumerationibusque noctium ac dierum
Horace, Carmen Saeculare 1.35: Siderum regina bicornis, audi,
All forms of sidus (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.