OBJECT LANGUAGE
The language the dictionary describes; the language the dictionary is about.
METALANGUAGE
The language in which the dictionary gives definitions and explanations. If same as object language, then the dictionary is monolingual. If different, then the dictionary is bilingual.
GENRE
What kind of dictionary are you looking for?
Etymological Dictionary of the Italian Language OBJECT LANGUAGE Italian METALANGUAGE Italian GENRE Etymological dictionaries http://www.etimo.it/
