Math Dictionary Project complete with rubric, handout and instructions. Students find a definition, draw an example, and come up with a way to remember the idea (either a picture or phrasing).
Students love putting their artistic talents to work. You can change the vocab to what you are currently using or use my prefilled middle school term. I have used them with success for the last 4 years with all levels of students.
Please let me know what you think, I'd love feedback.