Multilingual reference books
The Grand Dictionnaire Terminologique
The GDT is an online terminological database produced by the Office Québécois de la langue française or its partenerships. Each card contains information on a concept related to a specialized employment field and introduces words that designates it in French, English and sometimes in other languages.
One Look Dictionary Search
Allows searching a thousand dictionaries online, which amounts to approximately 9 million English words.