any of several peptide hormones that are released by the atria of the heart in response to an abnormal increase in blood volume and that modulate blood pressure and the excretion of sodium, potassium, and water.
atrial natriuretic factor n.
A peptide hormone released from cardiac atrial tissue that causes increased elimination of sodium by the kidney.
- Atrial septal defect
atrial septal defect atrial septal defect n. A defect in the interatrial septum of the heart, due to failure of the embryonic foramen to close normally.
congenital absence or loss of hair. atrichia a·trich·i·a (ā-trĭk’ē-ə, ə-trĭk’-) n. The congenital or acquired absence of hair. Also called atrichosis.
atrichous atrichous at·ri·chous (āt’rĭ-kəs) adj. Having no hair.
lying to under a trysail in heavy weather; .