Subject Dictionaries

http://www.artsalive.ca/en/mus/musicresources/dictionary.asp dictionary of music

http://www.hyperdictionary.com/medical dictionary of medical

http://www.etymonline.com etymology dictionary

http://www.netlingo.com/by-category/index.php subject dictionary

Abbreviations.com  Directory and search engine for acronyms and abbreviations.

http://www.acronymfinder.com/ Dictionary of acronyms and abbreviations.

computerlanguage.com Dictionary of Computers

investorwords.com – Dictionary of Financial

mathworld.wolfram.com – Dictionary of Math

Agricultural Dictionaries

http://www.israelagri.com/?CategoryID=525&ArticleID=1325

https://agclass.nal.usda.gov/glossary.shtml

http://dictionary.babylon-software.com/science/agriculture/

https://www.alphadictionary.com/directory/Specialty_Dictionaries/Agriculture/