Abbott-Smith Manual Greek Lexicon
ἄστρον (G798)
4 ἄστρον , -ου, τό , [in LXX chiefly for כּוֹכָב ;] mostly in pl. (as in cl.), the stars : Lk 21:25 , Ac 27:20 , He 11:12 ; in sing. (Xen., al.), only of some noted star; the symbol or image of a star, Ac 7:43 (cf. ἀστήρ , and v. MM, s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain