One of the features of a dictionary is to include the pronunciation. The Oxford English Dictionary is one of these, and is generally regarded as the most exhaustively comprehensive.
No, there is no such online dictionary.
Lucida
spell check
In a standard dictionary you can find a key to pronunciation marks within the definition
Noah Webster compiled the first dictionary of the American variant of English. Published in 1828, it was called "An American Dictionary of the English Language." Webster aimed to standardize American spelling and pronunciation and include words commonly used in America that were not present in British dictionaries.
babylonien
There are many places to find a pronunciation dictionary. Websters Dictionary is one of the most commonly used dictionaries and has a pronunciation key in it.
A good English dictionary willgive the correct spelling of a word, and its related words;give the correct pronunciation of the word;name the part of speech the word is;give an example of uses of the word;give the etymology of the word - its origins
Try dict.leo.org - it's an online German-English dictionary, where you can also listen to sound files to help you with pronunciation.
The key to pronunciation symbols is usually printed once, in the front of the dictionary. The pronunciation of individual words is given for each word, very early in the entry.
K. J. George has written: 'Gerlyver Kernewek kemmyn' -- subject(s): Cornish, Cornish language, Kernewek, dictionaries, English, English language 'Cornish-English Dictionary' 'The Pronunciation and Spelling of Revived Cornish' 'The New Standard Cornish Dictionary'
The pronunciation of words in the dictionary is shown by a system of phonetic symbols and respelling. These symbols represent the sounds of the word using the International Phonetic Alphabet (IPA) and help readers pronounce the word correctly. The respelling provides an approximation of the word's pronunciation using familiar English words.