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  Medical Glossary | MediChecks

glossary of medical terms

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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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Atherosclerosis narrowing of the lining of the arteries due to the accumulation of fat and other materials; leads to coronary heart disease, stroke, and other disorders

Athlete's foot an infection between the toes caused by a fungus, which leads to sore, cracked, and peeling skin

Atresia a birth defect in which a normal body opening or canal is absent; usually requires surgical repair soon after birth

Atria the two upper chambers of the heart; the singular form is atrium

Atrial fibrillation an irregular heartbeat in which the upper chambers of the heart (the atria) beat inconsistently and rapidly

Atrial flutter an irregular heartbeat in which the upper chambers of the heart (the atria) beat rapidly but consistently

Atrial septal defect a hole located in the wall between the two upper chambers of the heart

Atrophy the shrinkage or near disappearance of a tissue or organ

Attention-deficit disorder a disorder mainly present in children and adolescents, characterised by learning and behaviour problems, inability to pay attention, and sometimes hyperactivity

Audiogram a graph showing a person's hearing ability, determined from a set of tests examining hearing acuity of different sound frequencies

Aura a "warning" signal that comes before a migraine headache or an epileptic seizure, which might include emotions or sensations of movement or discomfort

Auscultation the act of listening to sounds within the body, such as the heartbeat, with a stethoscope

Autism a mental disorder characterised by an inability to relate to other people and extreme withdrawal

Autoimmune disease a disorder in which the body's immune system attacks itself

Autonomic nervous system the part of the nervous system that controls automatic body functions, such as heart rate, sweating, pupil dilation, and digestion; divided into the sympathetic nervous system and the parasympathetic nervous system

Autopsy the examination of a body following death, possibly to determine the cause of death or for research

Autosomal dominant a term describing a gene on any chromosome other than the sex chromosomes that produces its effect whenever it is present; can also describe the effect of the gene itself

Autosomal recessive a term used to describe a gene on any chromosome other than the sex chromosomes that produces its effect only when two copies of it are present; can also describe the effect of the gene itself

Axilla medical term for the armpit

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