If you’re a Mac user, why not try iflash? This nifty program lets you make flashcards for studying.
Or, why not make flashcards the old fashioned way? All you need are index cards (you choose the size) and something to write with. There’s an argument to be made for making flashcards by hand: for some of us, the act of writing things out helps us remember things.
One more thought: Try to write definitions in your own words rather than copying someone else’s definition word for word.
Anyone know a good flashcard program for non-Mac users?