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I know them all. I was saying that I only hadn't known how do biologists call them :)

It's a calque from a biologists' term вторичные половые признаки (I really don't have an idea how they are called in english, I mean breasts, public hair, etc :) ) My guess - secondary gender...

So then, is девушка the same as женщина? Sorry, I'm just a little confused.[/quote]

Strictly speaking both девочка and девушка derive from the word дева (a maiden, a virgin). So девушка turns...

If she's under the consent age you call her девочка :)

To be serious, девочка refers to a child while девушка refers to a grownup. Although, you may call your girlfried девочка.