þjóðlegrar
þjóðlegrar is an Old Norse adjective. It is the genitive singular feminine form of the adjective "þjóðlegur". The root of the word can be broken down into "þjóð" meaning "people" or "nation" and "-legur" which is a suffix forming adjectives, similar to "-ly" or "-like" in English. Therefore, "þjóðlegur" translates to "national" or "popular" in a sense relating to the people or nation.
As a genitive case, "þjóðlegrar" would typically indicate possession or a relationship to something belonging to