Merriam-Webster has released an iPad version of its dictionary app for iOS. Previously available only in an iPhone and iPod touch app, Merriam-Webster Dictionary HD provides an iPad-enhanced version of the entire Merriam-Webster Collegiate Dictionary with features such as voice search, synonyms, acronyms, example sentences and audio pronunciations. By using the integrated voice search, users can look up words without needing to know their spelling or use a scrolling index to browse through the entire dictionary. A history view also allows users to quickly reference words they’ve previously looked up. Merriam-Webster Dictionary HD is available from the App Store as a free ad-supported download.