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The thymus is a small organ behind the breastbone that helps to establish the body’s immune system early in life.—Devika Rao, TheWeek, 6 May 2026 The killer had broken 17 of her ribs, fractured her head in four places, broken her breastbone and inflicted other injuries on her body, autopsy reports showed.—Annie Vainshtein, San Francisco Chronicle, 31 Mar. 2026 Doctors opened her abdomen from her breastbone down, looking for more growths.—Los Angeles Times, 16 Feb. 2026 Starting from the breastbone, cut meat away from bone, cutting as close to the bone as possible.—Cathy Thomas, Oc Register, 9 Feb. 2026 See All Example Sentences for breastbone
Word History
First Known Use
before the 12th century, in the meaning defined above
Time Traveler
The first known use of breastbone was
before the 12th century