1. a brace that extends from the rear of the keel to support the rudderpost
The Collaborative International Dictionary of English v.0.48:
Skeg \Skeg\, n. [Prov. E., also a stump of a branch, a wooden
peg; cf. Icel. sk?gr a wood, Sw. skog. Cf. Shaw.]
1. A sort of wild plum. [Obs.] --Holland.
2. pl. A kind of oats. --Farm. Encyc.
3. (Naut.) The after part of the keel of a vessel, to which
the rudder is attached.
WordNet (r) 3.0 (2006):
n 1: a brace that extends from the rear of the keel to support