If you paste the URL (address) of a website into lingro, it will load the page and make all the words clickable. When you click on a word, it offers you the definition of it or a translation into the language you select. Many words also come with a sound file so that you can hear the way they are pronounced.
If you register (which is immediate) you can save your own word lists and play games with them to help you remember them. I've got my students, who are currently working on projects, to learn 10 new words related to their project topic per week using lingro as part of their homework.
Seeing is believing - so check it out!