If you are looking for online dictionaries, the Library does not subscribe to any comprehensive electronic English language dictionaries. However, there are many free dictionaries available online. Since they are free, these sites support their service with advertisements. This doesn't mean that the definitions they provide are not accurate. Some of the online dictionaries you might want to try are:
As for medical dictionaries online, Mirriam-Webster offers an advertisement-free version of its medical dictionary on the National Library of Medicine's consumer health site MedlinePlus http://www.nlm.nih.gov/medlineplus/mplusdictionary.html .
The HS/HSL also subscribes to a number of online medical dictionaries as e-books. You can find these in the E-Book list on our website (http://atoz.ebsco.com/Titles/4484#65/1/8,9,14/booksOnly) or by searching our online catalog (catalog.umd.edu) using the Advanced Search page and limiting the "format" to "E-Books."
If you are looking for print dictionaries, the Library has English dictionaries in both the Reference (1st floor) and Stacks (5th floor) collections under call numbers beginning PE1625-PE1628. Likewise, medical print dictionaries will be found in those collections under call numbers beginning R121.
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