WebDicty is the best free multilingual dictionary on the web. It has pre configured a number of on-line Web dictionaries for Spanish, English, German, French, Italian and Catalan, including definition and translation dictionaries (WordReference, Cambridge, Merrian Webster, Vox, Garzanti, Hachette, Gran Diccionari de la Llengua Catalana, Wahrig...)
WebDicty stays iconized on the task bar when minimized. It can be launched by pressing ALT+F10 from any application and it will automatically look for the word that is selected in that application in the current dictionary. Besides, double clicking on any word in the results of WebDicty (both right and left panel) will make WebDicty search for that word in the current dictionary. Currently, the source language is selected through the Categories menu. It accepts also some command line arguments:
/m launch minimized (iconized, in fact)
You can put it on your Start menu with /m so that it is auto starts (iconized) with Windows.
Operating System Support: Win/95/98/NT/2000/XP