Double-click a word to see its definition (from Wordnik).
What is Word up!?
Word up! is a Firefox add-on that allows users to double-click on a word to instantly view its definition from Wordnik.
Word up! is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Word up! if you trust the publisher.
Word up! has earned a fairly good reputation and likely can be trusted.