LibGuides: Online Reference Tools: Dictionaries

English Language Dictionaries

American Heritage Dictionary
Dictionary.com
Includes definitions from American Heritage, Random House, and Merriam-Webster.
Merriam-Webster Dictionary
ODLIS
Online Dictionary of Library and Information Science.
OneLook Dictionaries
Searches across multiple dictionaries.
Oxford English Dictionary
The accepted authority on the evolution of the English language, OED traces the meaning, history, and pronunciation of over half a million words.
Roget's Thesaurus