Iron-deficiency anemia occurs because of a lack of the mineral iron in the body. Bone marrow in the center of the bone needs iron to make hemoglobin, the part of the red blood cell that transports oxygen to the body's organs. Without adequate iron, the body cannot produce enough hemoglobin for red blood cells.
(Ä­n-fÃ»râ²mÄ­-tÄ) n. pl. inÂ·firÂ·miÂ·ties. 1. a. The condition of being infirm, often as associated with old age; weakness or frailty: the infirmity brought on by the disease. b. A bodily ailment or weakness: complained about his infirmities.
noun (plural immunities). 1 [mass noun] The ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells: immunity to typhoid seems to have increased spontaneously.More example sentences.1  Natural combativeness, an innate immunity to being cowed by the biggest names or the biggest occasions in football, is obviously a vital part of the equipment he carries on to the field. 2  But they also promise a partial immunity to the passage of time. Natural combativeness, an innate immunity to being cowed by the biggest names or the biggest occasions in football, is obviously a vital part of the equipment he carries on to the field. 2  But they also promise a partial immunity to the passage of time.