There are lots of sites on the www that are dictionaries and will certainly help students to find the information they need.
If you know more links that should be mentioned here let us know immediately! 
Wordwizard
Wordwizard offers a rich array of information on words. In the site´s own words, it is "your first port of call for anything concerning words and the English language".
  
Cool Word of the Day
Merriam-Webster´s Collegiate Dictionary privides the online dictionary for this site, which offers several interesting word games.
  
The Monthly Idiom
This site, part of the Comenius English Language Center, presents a new idiom monthly. For each idiom you will find the definition, the pronunciation (in an audio file) and a sample dialogue.
  
Commons Errors in English
This site clarifies common errors made with words or phrases.
  
Phrasal Verb Page
This page offers phrasal verbs in alphabetical order. If you choose L, you will find phrasal verbs, such as to lay off, to leave out, and to look down on, along with their definitions and a sample sentence.
  
Online Dictionary
This site provides 140.000 words and phrases.
  
Words in the News
This British Broadcasting Corporation site focuses on the language used in recent news reports.
  
English Vocabulary
Visitors to this site will find words in numerous useful categories.
  
ESL Slang Page
This page is one of many pages dedicated to students. You will find slang expressions, definitions and sample uses are provided.
  
ESL Idiom Page
Idioms are classified in three ways: a complete list of idioms in alphabetical lists of idioms with their meanings and sample uses and a random idiom.
  
Vocabulary Quizzes
The self study quizzes are divided into categories based on level of difficulty (easy, medium and difficult)
  
Online Exercises
Zunächst werden grammatische Besonderheiten erläutert, danach wird erworbenes Wissen in praktischen Übungen getestet und zuletzt eine Rückmeldung über den aktuellen Lernstand gegeben.
  
LEO - Online Dictionary
This site provides an uncomplicated service for more languages than only English and is very useful for checking words and spelling.
Helpful Links for your Studies
 
 

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