You can find glossa here: http://athirdway.com/glossa/
I've found it a helpful online presentation of Lewis and Short, and a downloadable offline version is available. Installing this under Windows is easy, but there is no Linux version.
Nevertheless Glossa can be made to run under wine, in Linux. Here is how I did it.
1. Use winetricks to install the Adobe Air runtime environment. You'll find it in winetricks under ...