This is the 1867th most frequent Portuguese word.
russa
"Russa" in Portuguese means "Russian" (feminine form).
Here, 'russa' is used as an adjective describing nationality, agreeing in gender and number with its subject.
Ela é uma cidadã russa.
She is a Russian citizen.
In this case, 'russa' serves as an adjective describing the origin of the doll.
A boneca russa é muito bonita.
The Russian doll is very beautiful.
Here, 'russa' refers to the Russian language, being an adjective that describes the noun 'língua'.