One strategy that I have used extensively now is the crossword. Students are really highly motivated to complete them, and it’s a great way to get subject terminology across. Particularly because in my subject (industrial technology) key terminology is very important, particularly in exam literacy.
One way to do this and make it more difficult is to do a Reverse crossword. You give students a copy of the crossword, with all the answers filled out, and students need to fill out the clues. This way, students are generating their own definitions of the terminology. Really, it’s just a tricky way to get students to be excited about doing a glossary.
An option then is to either give students the blank crossword then, swap cluees with a friend and to see if they can complete the crossword. You can also get students to enter their own clues into a program such as Eclipse Crossword, which is a free crossword puzzle program, which then generate a totally different puzzle based on the same clues, which a friend can then do. This then gives students instant feedback on whether their definitions are clear enough for somebody else to do.
Eclipse Crossword can even generate an interactive HTML puzzle for students to complete, if you have access for longer on the computers, or can simply print the puzzle to do.