Ordnett.no is available both as a website, mobil site and app at App Store and Google Play. With the app the dictionaries are available even when you don't have a network connection.
To access Ordnett you have to be at the NIH network and off campus you use Feide (Fronter-username/password).
You get access to several English and Norgewian dictionaries at Ordnett.no (synonyms, translation, medical dictionaries).
Please contact the library if you have any questions.