Some of the dictionaries available under the category "Miscellaneous":
Longman Pronunciation DictionaryLongman Dictionary of Common ErrorsMerriam Webster's Medical Desk DictionaryVocabulary in UseOxford Dictionary of QuotationsGerry's Vocabulary TeacherNTC's Dictionary of American Slang and Colloquial ExpressionsThe Concise New Partridge Dictionary of Slang and Unconventional EnglishOxford Collocations Dictionary for Students of EnglishOxford Business English Dictionary for learners of EnglishMicrosoft Computer DictionaryEnglish/Farsi WikipediaPicture DictionaryCambridge Phrasal Verbs DictionaryConceptual MetaphorPhysics FormularyEncyclopedia of Mathematics
Longman Pronunciation Dictionary


Longman Dictionary of Common Errors
Merriam Webster's Medical Desk Dictionary

Vocabulary in Use

Oxford Dictionary of Quotations
Gerry's Vocabulary Teacher
NTC's Dictionary of American Slang and Colloquial Expressions

Partridge Dictionary of Slang and Unconventional English
Oxford Collocations Dictionary for Students of English

Oxford Business English Dictionary for learners of English

Microsoft Computer Dictionary
Wikipedia

Picture Dictionary
Cambridge Phrasal Verbs Dictionary
Conceptual Metaphor
Physics Formulary
Encyclopedia of Mathematics
Chemical Engineering Dictionary
Cinematography Dictionary
Legal Dictionary
Mathamatics Dictionary
Polymer Keywords Dictionary
Strategic Management Dictionary
Sleep Interpretation (تعبیر خواب)