skeg

[skeg]
noun Nautical.
1.
a projection supporting a rudder at its lower end, located abaft a sternpost or rudderpost.
2.
an extension of the keel of a small craft, designed to improve steering.

Origin:
1590–1600; < Dutch scheg cutwater < Scandinavian; compare Old Norse skegg projection on the stern of a boat

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World English Dictionary
skeg (skɛɡ)
 
n
1.  a reinforcing brace between the after end of a keel and the rudderpost
2.  a support at the bottom of a rudder
3.  a projection from the forefoot of a vessel for towing paravanes
4.  any short keel-like projection at the stern of a boat
5.  (Austral) a rear fin on the underside of a surfboard
 
[C16: of Scandinavian origin; compare Icelandic skegg cutwater]

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Example sentences
There is a rudder mounted on pintles on the transom and skeg.
The bow is fitted with a skeg on the centerline to help give resistance to sideways motion and aid in steering.
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