This is the 2204th most frequent Catalan word.
congelat
Frozen.
In this sentence, 'congelat' is used as an adjective to describe the state of the fish being frozen.
He comprat peix congelat al supermercat.
I bought frozen fish at the supermarket.
Here, 'congelada' (feminine form) acts as an adjective describing the water's state due to low temperatures.
L'aigua del llac està congelada per culpa del fred.
The water in the lake is frozen because of the cold.
In this case, 'congelar' is used as a verb (infinitive) to denote the act of freezing food.