A simple plugin that allows you to create a number of glossaries to add terms to.
Free Dictionary Widget for WordPress provides an English Dictionary that gives you English definitions, synonyms, pronunciation, spelling and more.
Langtolang Dictionary provides a multilingual dictionary service from the sidebar.
Defithis adds the ability for your users to look up words from your content on Google -- or other services -- with one simple click.
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This widget adds a dictionary to your sidebar and displays words from it through ajax calls.
RSS link for this tag.