Using Excel, you can build a glossary and save it as a .CSV (Comma-Separated Value) file. If you want to add your own terms for specific items related to your course, this is a useful way to share that with students.
On the Home tab, under Cells, click Format, and then click AutoFit Column Width.
Once saved, you can upload your newly created file to Blackboard by going to the Glossary tool and using the Upload/Download menu.
See Blackboard’s Help page for more information on the Glossary tool: Blackboard Help: Glossary