Historical Thesaurus of English Contains the vocabulary of English from the earliest written records to the present with known recorded dates of use. Taken from the OED. http://www2.arts.gla.ac.uk/SESLL/EngLang/thesaur/homepage.htm - More
Learn English Vocabulary An English vocabulary journal online. English students, teachers, and
linguits are working together to create this online vocabulary journal. Read and
post English words, their definitions, and example sentences. Others will respond
with the same vocabulary words used in different contexts. Creating a personal
vocabulary journal will take longer and be less fun. Working alone is also less
effective because English students can see many examples while we all work together. http://www.learn-english-vocabulary.com - More
Yahoo! Roget's II Thesaurus Offers over 200,000 synonyms and cross-references. Features brief word definitions and category index. http://education.yahoo.com/reference/thesaurus/ - More