ἄστρον

ἄστρον, -ου, τό,

[in LXX chiefly for כּוֹכָב;]

(a) mostly in pl. (as in cl.), the stars: Lk 21:25, Ac 27:20, He 11:12;

(b) 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.).†