Deffinition of a skiff..

There isn't a "definitive definition" of skiff. The word has been used since at least the mid 19th century to describe a style of lightweight rowing boat. There are a number of "skiff clubs" for this type of rowing boat on the Thames, founded in the 19th century. It has also been used to describe working boats which ferried goods and people between the shore and anchored ships. The latter evolved into the racing skiffs of Sydney harbour in the late 19th century and some Australians will argue vehemently that the only correct use of the word in a sailing raceboat context is to describe those specific classes. However in the northern hemisphere at least, it's become used (or abused) as a marketing term for fast dinghies.