Gnosis is a Joomla! glossary component which is currently in development. The beta can be seen at work live on this website here:
http://www.hypermodern.org/index.php/gnosis
Gnoses also has a content plugin that will link predetermined words in your joomla/k2 articles and give those words a configurable tooltip. An example of a linked/tooltipped word can be found in the following word: qualiaqualiaDefinition: Qualia (/ˈkwɑːliə/ or /ˈkweɪliə/; singular form: quale (Latin pronunciation: [ˈkwaːle]) is a term used in philosophy to refer to individual i...
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