This is the 820th most frequent Icelandic word.
fisk
Fish.
In this sentence, 'fisk' is used as a noun in its singular form, referring to a specific fish that was caught.
Ég veiddi stóran fisk í gær.
I caught a big fish yesterday.
Here, 'fisk' is also used as a noun in its singular form, representing fish as a type of food.
Við borðum fisk oft í kvöldmat.
We often eat fish for dinner.
In this instance, 'fiskurinn' is the definite singular form of the noun 'fisk', referring specifically to 'the fish' in the context.