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he·mo·tho·rax or chiefly Brit hae·mo·tho·rax .hē-mə-'thō(ə)r-.aks, -'thȯ(ə)r- n, pl -tho·rax·es or -tho·ra·ces -'thōr-ə-.sēz, -'thȯr- blood in the pleural cavity
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he·mo·tho·rax (he″mo-thorґaks) [hemo- + thorax] a pleural effusion containing blood. Cf. hemorrhagic pleurisy. Called also hemathorax, hematothorax, and hemopleura.Medical dictionary. 2011.