1. A low level of prothrombin (factor II) in the circulating blood; results in long clotting time and poor clot formation and sometimes excessive bleeding; can result from vitamin K deficiency

Type of: blood disease, blood disorder

• OAS
• oasis
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• oaten
• Oates
• oath
• oatmeal
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• Oaxaca
• Oaxaca de Juarez
• Ob
• Ob River
• ob-gyn
• Obadiah
• Obama
• obbligato
• obconic
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• obduracy