Trisomy 18 (Edwards Syndrome) Glossary of Terms

The following are health and medical definitions of terms that appear in the Trisomy 18 (Edwards Syndrome) article.

Abdominal: Relating to the abdomen, the belly, that part of the body that contains all of ...

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Abnormal: Outside the expected norm, or uncharacteristic of a particular patient.

Amniocentesis: A before-birth diagnostic procedure during which a long needle is used to o...

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Amniotic fluid: The fluid bathing a fetus within the uterus, which serves as a shock absor...

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Analysis: In psychology, a term for conversation-based therapeutic processes used to gain ...

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Catheter: A thin, flexible tube.

Cell: The basic structural and functional unit of any living thing. Each cell is a small c...

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Chorionic villus sampling: A procedure for first-trimester prenatal diagnosis. Abbreviated...

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Chromosome: A carrier of genetic information that is visible under an ordinary light micro...

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Chromosomes: The microscopically visible carriers of the genetic material. They are compos...

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Diagnosis: 1 The nature of a disease; the identification of an illness. 2 A ...

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Down syndrome: A common birth defect that is usually due to an extra chromosome 21 (trisom...

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Edwards syndrome: Trisomy 18 syndrome. Children with the syndrome have an extra chromosome...

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Embryo: An organism in the early stages of growth and differentiation, from fertilization ...

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Estrogen: A female steroid hormone that is produced by the ovaries and, in lesser amounts,...

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Fetus: An unborn offspring, from the embryo stage (the end of the eighth week after concep...

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Genes: The basic biological units of heredity. Segments of deoxyribonucleic acid (DNA) nee...

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Genetic: Having to do with genes and genetic
information.

Gonadotropin: Hormones that are secreted by the pituitary gland, and that affect the func...

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HCG: Human chorionic gonadotropin.

Heart: The muscle that pumps blood received from veins into arteries throughout the body. ...

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Human chorionic gonadotropin: (hCG) A human hormone made by chorionic cells in the fetal ...

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Incidence: The frequency with which something, such as a disease or trait, appears in a pa...

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Insertion: A chromosome abnormality that is due to insertion of a segment from one chromos...

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Jaw: The movable junction of the bones below the mouth (the mandible) and the bone just ab...

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Maternal: 1. Pertaining to the mother as, for example, the maternal mortality rate....

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Maternal age: The age of the mother at the time of delivery. Advanced maternal age is usua...

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Menstrual: Pertaining to menstruation (the menses), as in last menstrual period, menstrua...

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Mosaic: A person or a tissue that contains two or more types of genetically different cell...

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Mouth: 1. The upper opening of the digestive tract, beginning with the lips and con...

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Nondisjunction: Failure of paired chromosomes to separate (to disjoin) during cell divisio...

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Placenta: A temporary organ that joins the mother and fetus, transferring oxygen and nutri...

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Pregnancy: The state of carrying a developing embryo or fetus within the female body. Thi...

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Prenatal: Occurring or existing before birth.

Prenatal diagnosis: Diagnosis before birth. Methods for prenatal diagnosis include ultraso...

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Prognosis: The forecast of the probable outcome or course of a disease; the patient's chan...

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Random: Determined solely by chance.

Respiratory: Having to do with respiration.

Sperm: A sperm is the male "gamete" or sex cell. It combines with the female &qu...

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Syndrome: A combination of symptoms and signs that together represent a disease process.

Trisomy: The presence of three copies of a chromosome rather than the normal two. The most...

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Ultrasound: High-frequency sound waves. Ultra-sound waves can be bounced off tissues by us...

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Vagina: The muscular canal that extends from the cervix to the outside of the body. It is ...

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Villus: 1. A tiny finger-like or hair-like projection. 2. A small vascular p...

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