Questions & Answers about Spegillinn er viðkvæmur.
It is the definite article attached to the end of the noun.
- spegill = mirror
- spegillinn = the mirror
This is very common in Icelandic: instead of putting a separate word like the before the noun, Icelandic usually adds the article as an ending.
Here, spegillinn is masculine singular nominative definite.
Er is the present tense, 3rd person singular form of vera, which means to be.
So:
- ég er = I am
- þú ert = you are
- hann / hún / það er = he / she / it is