The Monier-Williams Sanskrit-English Dictionary can be found online in several places.
University of Cologne (Koln) - link. This is the 2008 revision of the searchable digitized edition.
This – Cologne Digital Sanskrit Dictionaries – is an access page to a dozen different ways of accessing Sanskrit dictionaries.
University of Washington - link.
Koln also provides a link to scanned images of the pages of the dictionary. Link.
Sanskrit Dictionaries Online The Monier Williams Sanskrit-English Dictionary is online, at the University of Cologne:
Here is the advanced search
. It defaults to Denagari Unicode.
You may find it more useful to specifiy Roman Unicode
, which will give you English.
To get the definitions of yoga, type union into the seach window and specify Roman Unicode:
Another useful dictionary that goes both ways is the Spoken Sanskrit dictionary. You can enter an English word and get Sanskrit words, or vice versa.
The University of Cologne has a list of digitized and scanned dictionaries here.
A Sanskrit scholar has put up a page of links to various Sanskrit resources here.
Wikipedia has many articles on Sanskrit.
Apte’s The Practical Sanskrit-English Dictionary is online here.
Lexilogos has a good list of Sanskrit resources here.