'Servant girls' in the Bible

And Naomi said to Ruth, her daughter-in-law, It is better, my daughter, for you to go out with his servant-girls, so that no danger may come to you in another field.

So she kept near the servant-girls of Boaz to take up the grain till the cutting of the early grain and the cutting of the late grain were ended; and she went on living with her mother-in-law.