Vocabulary learning tool

[TooNice]

At the moment, I write down words I come across that I am unfamiliar along with their definitions on a notepad that I can just read over. It was never intended to be used for a learning spree, nor do I find it particularly good for that purpose. Do I have a better option?

[merdat]

I have a small Seiko Concise Oxford Thesautus which I use for unfamiliar words etc , it's good but I could do with the keyboard being bigger .