It's closer to "which", and matches with male nouns. "Quelle" is the female gender.
"Quel chien?" = "which dog?" ("chien" is male gender)
"Quelle espèce de chien?" = "which(what) kind of dog?" ("espèce" is the female gender)
2010年7月19日
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means "what"
Quel age as-tu?= how old are you?
2010年7月19日
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mainly it means which, but sometimes it means "what" for instance: quel heure est il? = what time is it? or quel est ton nom=what's your name?, quel age as-tu? litterally means: what's your age?
P.S quel est pour le masculin, pr le feminin: quelle