This is the 11888th most frequent Portuguese word.
protetora
Protective (feminine form).
Here 'protetora' describes someone's character or behavior, indicating their tendency to protect others.
Ela é uma mãe protetora, sempre cuidando de seus filhos.
She is a protective mother, always caring for her children.
In this case, 'protetor' is used as an adjective to describe something that provides protection, here sunscreen.
O filtro solar protetor protege a pele contra os raios solares.
The protective sunscreen protects the skin from the sun's rays.
'Protetora' is attributing the trait of protection to an object, the barrier, emphasizing its function.