Questions & Answers about Hurðarkarmurinn er mjór.
Because Icelandic makes very frequent use of compound nouns, and they are usually written as one word.
Here, hurðarkarmurinn is built like this:
- hurðar- = door-
- karmur = frame
- -inn = the
So the whole word means the door frame.
This is very normal in Icelandic. English often writes similar ideas as two words, but Icelandic usually prefers one compound word.
The first part of the compound comes from hurð (door), but in this compound it appears as hurðar-, which is based on the genitive singular form hurðar.
That is very common in Icelandic compounds: the first noun often appears in a genitive or genitive-like linking form.
So:
- hurð = a door
- hurðar- = door's / door-
Literally, the structure is something like door's frame, though in natural English we just say door frame.