This is the 17988th most frequent Polish word.
średnicy
"Średnicy" means "of the diameter" in English.
The word "średnicy" is in the genitive case as part of the measure specification, indicating the dimension of the pipe.
Rura ma średnicę dziesięciu centymetrów.
The pipe has a diameter of ten centimeters.
Here, "średnicy" is in the genitive case linked with the construction specifying the circle's diameter.
Na środku koła znajduje się punkt wyznaczający średnicę.
At the center of the circle lies the point defining the diameter.
In this case, "średnicy" refers to the diameter in a specific quantifiable context.