This is the 5324th most frequent Polish word.
sierść
"Fur" or "animal hair."
Here, 'sierść' denotes the protective layer of hair on animals that serves a functional purpose of providing insulation.
Niektóre zwierzęta mają sierść chroniącą je przed zimnem.
Some animals have fur that protects them from the cold.
Here, 'sierść' refers to the soft hair covering the body of a cat, describing its quality.
Sierść kota jest bardzo miękka.
The fur of the cat is very soft.
In this sentence, 'sierść' relates to the hair that animals lose during their natural process of shedding.