This is the 1182nd most frequent Catalan word.
cap
"Cap" in Catalan means "head."
In this sentence, 'cap' is used as a determiner meaning 'any' in the context of negation, indicating the absence of stars.
No veig cap estrella al cel.
I don't see any star in the sky.
Here, 'cap' is a noun meaning 'head,' referring to a part of the body.
El cap em fa mal.
My head hurts.
In this context, 'cap' is part of the expression 'de cap,' meaning 'headfirst' or 'headlong,' describing the manner of movement.