Merriam-Webster Online
Merriam-Webster provides a free online dictionary, thesaurus, audio pronunciations, Word of the Day, word games, and other English language resources.
Dictionary.com
This is a free online English dictionary, thesaurus and reference guide, crossword puzzles and other word games, online translator and Word of the Day.
American Heritage Dictionary
Over 90,000 entries feature 10,000 new words and senses, 70,000 audio word pronunciations, 900 full-page color illustrations, language notes and word-root appendixes.
RhymeZone
A language arts reference tool and comprehensive search engine for words. Includes the functions of a rhyming dictionary, thesaurus, and spelling checker, as well as an integrated full-text search engine for all of Shakespeare’s works and thousands of quotations and poems.”
On-Line Medical Dictionary
OMD is a searchable dictionary created by Dr. Graham Dark and contains terms relating to biochemistry, cell biology, chemistry, medicine, molecular biology, physics, plant biology, radiobiology, science and technology. It includes: acronyms, jargon, theory, conventions, standards, institutions, projects, eponyms, history, in fact anything to do with medicine or science.









