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The Collaborative International Dictionary
Breasthook

Breasthook \Breast"hook`\, n. (Naut.) A thick piece of timber in the form of a knee, placed across the stem of a ship to strengthen the fore part and unite the bows on each side.
--Totten.

Wiktionary
breasthook

n. (context nautical English) A horizontal timber fitted in the bows of a ship to add strength and to connect the sides to the stem

Usage examples of "breasthook".

Eighteen thousand treenails locked futtocks and planks, beams and breasthooks, stem and stern-post .