There is Google translate, but I don’t know how it works.
After there are thousands and thousands of on-line dictionaries, including my two main translation sources babylon (www.babylon.com) and wikipedia. The first one is quite good, but usually has little ressources to translate from another language than English. Thus you may hardly find anything from Spanish to French, for example. But Spanish/English, English/French or other does give pretty good results, except for specialized terms.
For specialized terms there is still http://iate.europa.eu, former eurodicautom.
For other specialized dictionaries, including ancient Greek, latin, aramean and other dead languages just enter ‘dictionary+ancient greek’, you’ll find almost everything!
Difficult to find though the … hebrew pronounciation …
These dictionaries have no indications concerning grammar nor specific semantic field of use of the word. Take care!