This is the 11183rd most frequent Russian word.
греческий
"Греческий" means "Greek" in English.
The word 'греческий' is attributive, describing the origin or style associated with Greece, here referring to the salad style.
Этот салат называется греческий.
This salad is called Greek.
Here, 'греческий' directly modifies 'язык' to specify the type of language being studied.
Он изучает греческий язык в университете.
He studies the Greek language at the university.
The adjective 'греческие' describes 'мифы' (myths), attributing their origin or cultural association to Greece.