A baguette (/bæˈɡɛt/; French pronunciation: [baˈɡɛt], feminine noun) is a long thin loaf of French bread[1] that is commonly made from basic lean dough (the dough, though not the shape, is defined by French law). It is distinguishable by its length and crisp crust. A standard baguette has a diameter of about 5 or 6 centimetres (2 or 2⅓ in) and a usual length of about 65 centimetres (26 in), although a baguette can be up to a metre (39 in) long.The word "baguette" was not used to refer to a type of bread until 1920, but what is now known as a baguette may have existed well before that. The word simply means "wand" or "baton", as in baguette magique (magic wand), baguettes chinoises (chopsticks), or baguette de direction (conductor's baton).
A less direct link can be made however with deck ovens, or steam ovens. Deck/steam ovens are a combination of a gas-fired traditional oven and a brick oven, a thick "deck" of stone or firebrick heated by natural gas instead of wood. The first steam oven was brought (in the early nineteenth century) to Paris by the Austrian officer August Zang, who also introduced Vienna bread (pain viennois) and the croissant, and whom some French sources thus credit with originating the baguette. Deck ovens use steam injection, through various methods, to create the proper baguette. The oven is typically heated to well over 205 °C (400 °F). The steam allows the crust to expand before setting, thus creating a lighter, airier loaf. It also melts the dextrose on the bread's surface, giving a slightly glazed effect.
The law in question appears to be one from March 1919, though some say it took effect in October 1920: It is forbidden to employ workers at bread and pastry making between ten in the evening and four in the morning. The rest of the account remains to be verified, but the use of the word for a long thin bread does appear to be a twentieth century innovation.