1) Borers 2) Teredinidae 1) Nautical terminology 
Shipworms is a name of a group of saltwater clams with long, soft, naked bodies; they are marine bivalve molluscs in the family Teredinidae. They are notorious for boring into (and commonly eventually destroying) wood that is immersed in sea water, including such structures as wooden piers, docks and ships; they drill passages by means of a pair o...