Important links of few dictionaries

1. http://dictionary.cambridge.org/

2. https://en.oxforddictionaries.com/

3. http://www.ldoceonline.com/

4. http://www.shabdkosh.com/ (for Hindi meaning)

5. http://www.thefreedictionary.com/

6. http://www.mnemonicdictionary.com/ (for mnemonics)