This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A temporary, quickly constructed fortification, usually breast-high. See Synonyms at bulwark.

n. a fortification consisting of a breast-high bulwark; a parapet

n. A railing on the quarter-deck and forecastle.

n. a parapet

n. A defensive work of moderate height, hastily thrown up, of earth or other material.

n. A railing on the quarter-deck and forecastle.

n. In fortification, a hastily constructed work thrown up breast-high for defense.

n. Nautical, a sort of balus-trade of rails or moldings which terminates the quarter-deck and poop at the fore ends, and also incloses the forecastle both before and behind.

n. The parapet of a building.

n. fortification consisting of a low wall

"These stones are much larger than our own, are angular, and of a size that works very well into a wall; and the materials being plenty, a breastwork, that is proof against everything but artillery, is soon formed by a crowd."

fortification    munition   

machicolation   

breastworks    stockade    palisade    barricade    entrenchment