Questions & Answers about Hárið hennar er langt og þykkt.
Hárið is hár (hair) + the definite article -ið, which means “the”.
- hár = hair
- hárið = the hair
In Icelandic, the definite article is usually attached to the end of the noun instead of appearing as a separate word like the in English.
Because hár is neuter singular, its definite form in the nominative is hárið.