There are French dictionaries on the regular shelves on the 3rd floor of Willis Library. Some of them are non-circulating, but some may be checked out.
Call number PC 2625 is a good place to browse for dictionaries in French only. Call number PC 2640 is a good place to browse for French-English dictionaries.
Please note that some French dictionaries are on reserve in the Music Library; ask for these at the Music Library Services Desk on the 4th floor.