Category: H
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Holoacardius
A congenitally deformed monozygotic twin fetus with no heart. The in utero circulation is obtained from the heart of the twin to which the deformed fetus is attached.
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Holmium
A rare earth metal, whose atomic weight is 164.930 and atomic number is 67.
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Holmgren’s test
An obsolete test in which the patient matches colored skeins of yam to test for color blindness.
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Hollow
Having a cavity or space inside.
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Holiday heart syndrome
The association of cardiac arrhythmias, especially atrial fibrillation, with binge drinking.
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Holding area
An Emergency Department area in which patients are kept temporarily before being transferred to an intensive care unit.
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Holden’s line
A wrinkle or indistinct furrow in the groin at the junction of the thigh and the abdomen laterally indicating the position of the capsule of the hip joint.
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Holandric
Transmitted only by a gene in the nonhomologous portion of the Y chromosome.
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Hofbauer cell
A macrophage found in the connective tissue of the chorionic villi.
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Hodge’s plane
A plane running parallel to the pelvic inlet and passing through the second sacral vertebra and the upper border of the os pubis.