This is the 15176th most frequent Russian word.
полячка
A Polish woman.
In this sentence, the word 'полячка' is used to denote a female Polish person as part of the context of a visitor.
Полячка приехала в гостях в Москву.
The Polish woman came to Moscow as a guest.
Here, 'полячка' refers to the ethnicity or nationality of the mentioned female individual.
В классе появилась новая ученица, полячка по происхождению.
A new student appeared in the class, a Polish girl by origin.
The term 'полячка' in this sentence refers to a female character or actress identified as Polish.