Feminine of a derivative of stratos (an army; from the base of stronnumi, as encamped); camp-likeness, i.e. An army, i.e. (figuratively) the angels, the celestial luminaries -- host.
KJV: Then God turned, and gave them up to worship the host of heaven; as it is written in the book of the prophets, O ye house of Israel, have ye offered to me slain beasts and sacrifices by the space of forty years in the wilderness?
NASB: "But God turned away and delivered them up to serve the host of heaven; as it is written in the book of the prophets, 'IT WAS NOT TO ME THAT YOU OFFERED VICTIMS AND SACRIFICES FORTY YEARS IN THE WILDERNESS, WAS IT, O HOUSE OF ISRAEL?