This is the 796th most frequent Hungarian word.
melyik
"Which"
Here, 'melyik' is used as an interrogative determiner to ask about a specific choice among a group.
Melyik könyvet olvastad el múlt héten?
Which book did you read last week?
In this case, 'melyik' is embedded in a subordinate clause, introducing an indirect question about selection.
Nem tudom, melyik útra kellene lépnünk.
I don't know which road we should take.
Here, 'melyik' is used to specify or identify one nation from a group of possible countries, acting as an interrogative identifier.