This is the 11458th most frequent Polish word.
jad
"Jad" in Polish means "venom" or "poison."
Here, 'jad' means 'venom' as a toxic substance produced by an organism.
Wąż zębożerny wydziela trujący jad.
A fang-bearing snake secretes poisonous venom.
In this context, 'jad' is used metaphorically to describe spite or malice in someone's speech.
Jej słowa były pełne jadu.
Her words were full of venom.
This sentence uses 'jad' to refer to venom as a biological substance used by certain creatures for protection.