Also, if that author couldn't think of a real word to describe the dish then he/she wasn't a very good author.
The author was Aristophanes. The word is the longest word known to appear in a work of literature. The longest word in a dictionary is, currently, Pneumonoultramicroscopicsilicovolcanoconiosis. Though it is a technical name for a certain type of lung disease that exists for the sole purpose of being the longest word in the English language.

Also it should be noted that the second word that the Cactuar posted was originally a Greek word to describe a dish made up of a whole lot of fish and other things.