This is the 18028th most frequent Polish word.
żelazo
Iron.
In this sentence, 'żelazo' represents the chemical element iron.
Żelazo jest jednym z najważniejszych pierwiastków na Ziemi.
Iron is one of the most important elements on Earth.
Here, 'żelazo' refers to dietary iron, essential for the human body.
Codziennie biorę suplementy żelaza, aby wzmocnić zdrowie.
I take iron supplements daily to improve my health.
'Żelazo' in this case pertains to the material, iron, used in forging tools and weapons.