Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
Heterosexual: A person sexually attracted to persons
of the opposite sex. Or a person who has sexual relations with the opposite sex. Colloquially known as "straight."
The term "heterosexual" can also be an adjective....
Heterosexuality: Sexuality directed toward someone of the opposite
Heterotaxy: The abnormal placement of organs due to failure to establish the normal left-right patterning during embryonic development. The morbidity (disease) and mortality (death) from heterotaxy are caused by congenital defects, especially congenital heart disease.
Mutations in the zinc finger ...
Heterotopic: In the wrong place, in an abnormal place, misplaced. From the Greek roots "hetero-" meaning "other" + "topos" meaning "place" = other place.
For example, heterotopic bone formation is the formation of bone where it is not normally found, as in muscle....
Heterotrisomy: Trisomy of different chromosomes. The occurrence of two children in the same family, one with trisomy 18 and the other with trisomy 21, is an instance of heterotrisomy.
See also: Homotrisomy....
Heterozygote: A person possessing two different forms of a
particular gene, one inherited from each parent. A heterozygote is
also called a carrier.
For example, a woman who is a heterozygote for cystic fibrosis
(CF) carries the CF gene on one of her chromosomes number 7 and the
normal paired (...
Heterozygous: Possessing two different forms of a
particular gene, one inherited from each parent. A person who is heterozygous is called a heterozygote or a gene carrier.
Heterozygous is in contrast to homozygous, the possession of two identical copies of the same gene....
HEV: Hepatitis E virus....
Hex-A deficiency: See: Tay-Sachs disease....
Hexadactyly: The presence of an extra digit, a sixth finger or toe, which is a very common congenital malformation (birth defect).
This condition is called hexadactyly. The word hexadactyly literally means six digits. In medical usage, hexadactyly does not specify whether the six digits are finge...
Hexalen: Brand name of altretamine. For more information, see: altretamine....
Hexenmilch: See: Witch's milk....
Hexosaminidase A: An enzyme which, when deficient, causes Tay-Sachs disease, a progressive fatal neurologic disorder concentrated in people of European Jewish (Ashkenazi) descent. See: Tay-Sachs disease....
Hexosaminidase A deficiency
Hexosaminidase A deficiency: See: Tay-Sachs disease....
Hg: Symbol for the metallic element mercury.
The abbreviation "mm Hg" means millimeters of mercury, the height of a column of mercury, as in a blood pressure reading.
Mercury is poisonous to people. See Mercury poisoning....