Each article contains the content of the pop-up.
The article ID is used to link the defintion (the content of the article) to the text of the page for which the definition pertains to.
This linkage is via jQuery. See the file: public_html/plugins/system/jbootpopovers/js/poploader.js
NOTE: Unpublishing the article causes an error message to display. To eliminate the term, the above mentioned jQuery file must be changed.