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The Collaborative International Dictionary
Breastrail

Breastrail \Breast"rail`\ (-r[=a]l`), n. The upper rail of any parapet of ordinary height, as of a balcony; the railing of a quarter-deck, etc.

Wiktionary
breastrail

n. The upper rail of any parapet of ordinary height, as of a balcony, the railing of a quarterdeck, etc.