A free program for Android, by MobiSystems.

The free Collins Greek Dictionary for Android is a comprehensive and user-friendly dictionary for Greek and English language learners. If you have been studying either language for years and still need to look up some words, this is the perfect app to help you do just that.

As soon as you launch it, you will be greeted with the main menu, where you can select either the English or the Greek language. Once you have made your selection, you will be taken to the search screen, where you will be able to type in the word you are looking for.