This is the 5324th most frequent Polish word.
sierść
"Fur" or "animal hair."
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.
Pies zgubił dużo sierści podczas linienia.
The dog lost a lot of fur during shedding.
Here, 'sierść' denotes the protective layer of hair on animals that serves a functional purpose of providing insulation.