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plural breastbones
(anatomy) The central narrow bone in the front of the chest, connecting the collarbone and the top ribs. quotations examples
He lapped out of his hand, then sat up in the sunlight, crossing his shins in front of him, and after a time let his woolly head fall on his breastbone.
1899 (please specify the page), Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, New York, N.Y.: The Leonard Scott Publishing Company, […], part