skeg
noun
ˈskeg 
variants or less commonly skag
ˈskag
1
: the stern of the keel of a ship near the sternpost
especially : the part connecting the keel with the bottom of the rudderpost in a single-screw ship
2
: a fin situated on the rear bottom of a surfboard that is used for steering and stability
Example Sentences
Recent Examples on the Web One is how well a large extension to the new tugs' underside, called a skeg and designed to stop tankers by creating extra drag, will affect maneuverability. 
Alex Demarban, Anchorage Daily News, 26 Jan. 2018 As the water dropped below the bottom of the depth gauge, the blocking under the skeg at the rear of the hull peeped above the surface. Lawrence Specker, AL.com, 19 Oct. 2017 There are also afts called skegs and rudders which prevent the seaplane from tipping over in the ocean. David Grossman, Popular Mechanics, 22 Sep. 2017
Alex Demarban, Anchorage Daily News, 26 Jan. 2018 As the water dropped below the bottom of the depth gauge, the blocking under the skeg at the rear of the hull peeped above the surface. Lawrence Specker, AL.com, 19 Oct. 2017 There are also afts called skegs and rudders which prevent the seaplane from tipping over in the ocean. David Grossman, Popular Mechanics, 22 Sep. 2017 Word History
Etymology
Middle English skegge, from Old Norse skegg cutwater, literally, beard — more at shag
First Known Use
13th century, in the meaning defined at sense 1
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