This was left as an edit to another post by an anonymous user, but should be its own answer.
Go to the Google Play app on your mobile phone and go to Menu -> My Apps, then swipe across to All Apps. Delete the app from there using the symbol button on the right, and the app will also delete from the online Play Store list.
In order to delete several applications at a time, long-press an application until a blue top bar appears; then short-press some other applications, and you will be able to delete all selected applications by pressing the deletion symbol in the upper-right corner, in the blue bar. This is especially practical because you jump to the top of the list after deleting an application, and the list is only sorted by date of first installation—at least at this moment.