sidus

Etymology
Tentatively thought to derive from a, with a putative semantic shift (from hunters' jargon) from "target" > "star". Further origin unclear, with multiple theories proposed:
 * Some derive this from, whence , , ; however there are phonetic problems, most notably the initial in Greek instead of expected *.
 * Rix, connecting the word to 🇨🇬 and 🇨🇬, derives the terms from a, and the Latin from a reduplicative form >  >  > . This is semantically tenuous.
 * Compare . This is semantically unconvincing.
 * Possibly borrowed from a.
 * Perhaps from a, from , whence . De Vaan tentatively prefers this derivation.

Noun

 * 1) group of stars, constellation, asterism
 * 2) a star
 * 3)  the night sky
 * 4)  a season (of the year)
 * 1)  the night sky
 * 2)  a season (of the year)