Buddhism Glossary 佛學辭典
Chinese only
Buddhistdoor Dictionary 佛門網佛學辭典
Chinese and English
Fo Guang Shan Online Dictionary 佛光大辭典
Digital Dictionary of Buddhism 電子佛教辭典
when prompted for a login or password, use “guest”
Yahoo Dictionary
Chinese and English translation
Google Dictionary
Cambridge Dictionaries Online
Multiple languages available
Webster Dictionary
English only
Merriam-Webster Dictionary