The Collaborative International Dictionary
Sternson
Sternson \Stern"son\, n. [See Stern, n., and cf. Stemson.] (Naut.) The end of a ship's keelson, to which the sternpost is bolted; -- called also stern knee.
Wiktionary
sternson
n. (context nautical English) The end of a ship's keelson, to which the sternpost is bolted; called also stern knee.