>>>>>But this is the usage of "what" to mean quality, not identity or definition. "what am I again?" - "you're mad". I brought this up because last time we discussed this someone (you, Alan or someone else) pointed out that that usage is simply not in use, or something to that effect. So, my question is - does this usage of "what" fall under regular ones, or is it just... the workaround for the lack of word which would mean "kakav"?
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>>>My question was whether the usage as in the example I found was correct or not.
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>>As I recall it's ho2 one would say the expression.
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>So, "what" can mean both "give me a definition of", "give me a classification of", "give me the role/importance/etc of", i.e. any other noun that's representative of the object, but can also mean "give me the quality/property of".
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>Found a nice example for the latter in Morton-Benson's dictionary. Asked "what is the weather", nobody responds with a definition ("it's a natural phenomenon studied in meteorology", or any other "it is a ..."), but with quality ("nice", "sunny", "rainy", "windy" etc). So, I agree to conclude that both usages are regular.

I've honestly not heard "What's the weather". Normally I hear "What's it like out" or "What's the weather like". Or maybe "Is it raining".