This is the 457th most frequent Portuguese word.
brasileira
"Brasileira" means "Brazilian" (feminine form).
In this sentence, 'brasileira' is an adjective describing the noun 'comida' (food), indicating that the cuisine pertains to Brazil.
A comida brasileira é muito saborosa.
Brazilian cuisine is very tasty.
Here, 'brasileira' functions as a noun indicating the nationality or origin of the woman referred to in the sentence.
Ela é uma brasileira que vive no exterior.
She is a Brazilian woman living abroad.
In this sentence, 'brasileira' is again used as an adjective to describe the noun 'cantora' (singer), specifying that she is from Brazil.