add-on
- n a component that is added to something to improve it
- n a supplementary component that improves capability
- The iPhone has the most elegant user interface of any phone I've seen, and its add-on apps make it more than just a toy you'll soon outgrow.
- Look out, surfers: there's a wave of controversy headed your way over the latest version of the Google Toolbar, a popular Web browser add-on that attaches a search box and an extra .
- The site has more than 30,000 add-on applications among them, games, interactive maps and quizzes to bling out your personal page (or spam your friends), and a redesign .