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Biology Online - Dictionary
This is a completely open and editable dictionary which utilizes a WiKi concept, so that any user can make a contribution.
National Cancer Institute (NCI) Dictionary of Genetics Terms
The NCI Dictionary of Genetics Terms contains technical definitions for more than 200 terms related to genetics.
MeSH - Medical Subject Headings
The National Library of Medicine's (NLM) online thesaurus provides definitions of all of the terms used in its indexing vocabulary as well as directing the user to other potentially useful search terms.
Talking Glossary of Genetic Terms
The Talking Glossary features more than 250 common genetic terms pronounced and explained in an easy-to-understand way by leading scientists and professionals at the National Human Genome Research Institute. In addition to definitions, specialists in the field of genetics share their descriptions of terms, and many terms include images, animation and links to related terms.