I added an entry to the BibleWorks blog on a new addition to the ELM to help out with Latin text. See the blog entry or just add the following to your ShellExec:

// External Link #28
[Latin lookup in WORDS]
Operation = Open
Directory = NULL
File = http://lysy2.archives.nd.edu/cgi-bin/words.exe?<dummy>
Parameters = NULL
MenuLocation = Browse Window Latin
TextType = Latin Text
MapToVersion = NULL
Lookup = Form
MenuText = Latin lookup in WORDS
Enabled = 1