Kikin software is a Google Chrome browser extension that will help you to find information about any word on which you press and hold the mouse cursor. Also, you can filter the results by images, videos, news, or maps and you can search for instant definitions. It is also available for Android devices. For further information, you can check the official web page.
If you don't need the utility, type chrome://extensions in the Google Chrome address bar and press the thrash can icon next to the Kikin toolbar.