French language dictionaries can be found in Hatcher Reference Room and the South Stacks in the call number range PC2001 - PC3761.
Your Dictionary: French dictionaries
Collection of French-English and specialized French only dictionaries
ARTFL's Dictionnaires d'autrefois include Dictionnaire de l'Académie Française, Littré’s Dictionnaire de la langue française, as well as Jean Nicot’s Le Thresor de la langue françoyse, tant ancienne que moderne and Jean-François Féraud’s Dictionaire critique de la langue française.
Trésor de la langue française (in print)
Not the dictionary one might consult for a quick definition, but if you wish to understand a word in all in meanings and ramifications, its orthographic and etymological history, then this is the dictionary for you. Though limited to the French of the 19th and 20th centuries, this is still one of the most comprehensive and exhaustive of all dictionaries.
Hatcher Graduate Library PC 2650 .I32