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Definition of hypovolemia in US English - a decreased volume of circulating blood in the body.
Medical Definition of Hypocalcemia. Hypocalcemia: Lower-than-normal level of calcium in the blood, which makes the nervous system highly irritable, as evidenced by tetany (spasms of the hands and feet, muscle cramps, abdominal cramps, and overly active reflexes). Chronic hypocalcemia contributes to poor mineralization of bones, soft bones (osteomalacia), and osteoporosis.