Stri means which expands. Vistara, expands. I am alone. I accept wife, stri, and with her cooperation I expand. So one who helps me to expand, that is called stri. Every Sanskrit word has got meaning. Why woman is called stri? Because she helps, expanding myself. How expanding? Dehapatya-kalatradisu SB 2.1.4. I get my children. First of all I was affectionate to my body. Then, as soon as I get a wife, I become affectionate to her. Then, as soon as I get children, I become affectionate to children. In this way I expand my affection for this material world. This material world, attachment. It is not required. It is a foreign thing. This material body is foreign. I am spiritual. I am spiritual, aham brahmasmi. But because I wanted to lord it over the material nature, Krsna has given me this body.
There are 3 classes of less intelligent. They are stri, shudra and dwijabandu. .. Women, working class men and fallen brahmins.