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Skeg
A skeg, (skegg or skag) is a sternward extension of the keel of boats and ships which have a rudder mounted on the centre line. The term also applies to the lowest point on an outboard motor or the outdrive of an inboard/outboard.〔"A small fin fitted aft of the keel to protect the rudder and propeller, and improve steering and tracking." 〕〔"Skeg, or Skegg. A projecting stump formerly left on the keel, abaft the stern-post. The after-end of the keel. The composition piece supporting the heel of an equipoise rudder." at Internet Archive
〕 In more recent years, the name has been used for a fin on a surfboard which improves directional stability and to a moveable fin on a kayak which adjusts the boat's centre of lateral resistance (it moves the center of resistance relative to the center of effort). The term is also often used for the fin on water skis in the U.S. and for the tail bumpers of aircraft in the US Navy.
==Etymology==
The word originates in the Scandinavian word for beard; in Old Norse, ''skegg''. In Icelandic the word remains ''skegg'', in modern Norwegian Bokmål and Nynorsk, it appears as ''skjegg'', in Swedish, it is ''skägg'' and in Danish, ''skæg''. The Norwegian pronunciation of the letter combination ''skj'' is as in the English ''sh''. The word is related to the English ''shaggy''. It also appears in the English place name Skegness - 'beard point', from the way in which a series of tombolos forms, towards the nearby Gibraltar Point. Here, the English pronunciation reflects a probable Danish origin, which pronounces the ''sk'' letter combination as an English speaker would expect.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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