Before you begin searching for information, you should understand the topic you are researching. Dictionaries and encyclopedias are a good place to begin. Dictionaries provide definitions of unfamiliar terms, whilst encyclopedias give more detailed explanation and overview of topics.
Dorland's Illustrated Medical Dictionary by 
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The Oxford English Dictionary is an unsurpassed guide to the meaning, history, and pronunciation of over half a million words, both present and past.
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