ON LINE DICTIONARIES

https://www.oxforddictionaries.com/

http://www.macmillandictionary.com/

www.dictionary.com/

http://dictionary.cambridge.org/

www.merriam-webster.com/

www.thefreedictionary.com

www.alphadictionary.com/

http://www.computerlanguage.com/

http://mathworld.wolfram.com/

https://www.vocabulary.com/dictionary/

www.lexicool.com/online-dictionaries-by-subject.asp

https://www.thesciencedictionary.com

http://www.physicsphenomena.com/Physicsdictionary.htm

http://www.biology-online.org/dictionary/Main_Page

http://hindi-english.org

http://www.shabdkosh.com

http://www.synonymy.com

http://www.antonymswords.com

http://spokensanskrit.de/index.php

http://sanskritdictionary.com