A gulet is a traditional design of a two-masted wooden sailing vessel from the southwest coast of Turkey, although similar vessels can be found all around the eastern Mediterranean. Today this type of vessel, varying in size from 14 to 35 metres, is popular for tourist charters. For considerations of crew economy, diesel power is now almost universally used and many are not properly rigged for sailing.
The Turkish word gulet is a loanword from French gouëlette (present-day spelling goélette), meaning "schooner". The French word is probably a diminutive form of goéland, meaning (and etymologically related to the word) "gull", ultimately of Celtic origin.
Information based on http://en.wikipedia.org/wiki/Gulet