borðinu
Borðinu is the definite dative singular form of the Icelandic noun borð, which means table. In Icelandic, nouns decline by case and number, and the definite article is expressed as a suffix. The definite nominative/accusative form is borðið, while the definite dative singular form is borðinu. The genitive singular is borðs. This form, borðinu, is used after prepositions that govern the dative or when indicating the location of something relative to the table.
The noun borð is used for a variety of senses related to a table or a board,
Etymology traces borð to Old Norse borð, with related meanings tied to a flat surface or dining