Note: You are currently viewing documentation for Moodle 3.3. Up-to-date documentation for the latest stable version of Moodle is probably available here: mod/glossary/showentry.
An entry is part of the Glossary module module activity. Typically a student clicks on a highlighted word and is taken to the entry. Entries can be edited as part of a glossary activity. Usually there is a link to the glossary on the entry page when viewed by a student.