Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
μύιαι A fly LXX.Eccl.10.1
μυϊαν fly LXX.2Kgs.1.3LXX.2Kgs.1.6LXX.2Kgs.1.16
μυίαν fly LXX.2Kgs.1.2
μυίαισ flies LXX.Isa.7.18

Liddell-Scott-Jones

μυῖα (muia) a fly G:N-F

μυῖα,

Attic dialect μῦα [Refs 4th c.BC+]: :— fly, [Refs 8th c.BC+]; carrion-fly, bluebottle, [Refs 8th c.BC+]; gall-insect, [Refs 4th c.BC+], of excessive boldness, [Refs 8th c.BC+]; δειπνεῖν ἄκλητος μ. a fly for coming to dinner uninvited, [Refs 4th c.BC+]; ἐλέφαντα ἐκ μυίας ποιεῖν 'to make a mountain out of a molehill', [μυῖα στρατιῶτις, μ. κύων, [prev. passage]; δραίνω μυῖ᾽ ὅσον 3rd c.BC: Herodas Mimographus 1.15. ">Refs 3rd c.BC+]

__II χαλκῆ μυῖα a game like blindman's-buff, [Refs 2nd c.AD+]; compare μυΐνδα.
__III used by peasants of bees, [Refs]. (Cf. Lithuanian musià 'fly', Latin musca, etc.)