Achoo syndrome
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  Achoo syndrome

Achoo syndrome

   A disorder characterized by nearly uncontrollable paroxysms of sneezing provoked in a reflex fashion by the sudden exposure of a dark-adapted subject to intensely bright light, usually to brilliant sunlight. The number of successive sneezes is usually 2 or 3, but can be up to about 40. The achoo syndrome is also called the photic sneeze reflex or the helio-ophthalmic outburst syndrome.


An automatic, involuntary movement.

A grouping of signs and symptoms, based on their frequent co-occurrence, that may suggest a common underlying pathogenesis, course, familial pattern, or treatment selection.

To exhale breath from the nose and mouth in a sudden, involuntary action as a result of irritation of the mucous membranes of the nose.


A genus of gram-negative organisms including saprophytic and parasitic or pathogenic species.

Acholeplasma laidlawii
An organism originally isolated from sewage, manure, humus, and soil, but recently found as a parasite in mammals and birds.

Gram-negative organisms including apparently free-living saprophytes as well as mammalian and avian parasites, and possibly pathogens.

A genetic disorder of bonwe resulting in short-limbed dwarfism. There are a number of different types of achondrogenesis. See: Achondrogenesis type II.

Achondrogenesis type II
Severe inherited disorder of bone growth characterized by a short body and limbs and a lack of bone formation in the spine and pelvis.

An inherited form of short-limbed dwarfism.

An autosomal dominant disorder that is the most frequent form of short-limb dwarfism. Affected individuals exhibit short stature caused by rhizomelic shortening of the limbs, characteristic facies with frontal bossing and mid-face hypoplasia, exaggerated lumbar lordosis, limitation of elbow extension, genu varum, and trident hand. (Online Mendelian Inheritance in Man,, MIM#100800, April 20, 2001)


A lack of hydrochloric acid in the digestive juices in the stomach (in technical terms, so that the pH of the stomach contents fails to fall below 4.0 under maximal stimulation). Hydrochloric acid helps digest food.

A genetic disorder of bonwe resulting in short-limbed dwarfism. There are a number of different types of achondrogenesis. See: Achondrogenesis type II.

Achondrogenesis type II
Severe inherited disorder of bone growth characterized by a short body and limbs and a lack of bone formation in the spine and pelvis.

Achoo syndrome

See: Tetracycline.

Acid deposition
A complex chemical and atmospheric phenomenon that occurs when emissions of sulfur and nitrogen compounds and other substances are transformed by chemical processes in the atmosphere and then deposited on earth in either wet or dry form. The wet forms, popularly called acid rain, can fall to earth as rain, snow, or fog. The dry forms are acidic gases or particulates.

Acid indigestion
Excessive secretion of hydrochloric acid by the stomach cells. Medically known as hyperchlorhydria. Sometimes used interchangeably with heartburn. See also: Heartburn.

Acid phosphatase
Acid phosphatase is an enzyme that works under acid conditions and is made in the liver, spleen, bone marrow and the prostate gland. Abnormally high serum levels of the enzyme may, for example, indicate prostate disease (infection, injury, or cancer).

Acid rain
Rain resulting from the combination of fossil fuel emissions and water in the atmosphere. The environmental effects of acid rain include the acidification of lakes and streams, damage to trees at high altitude, the acceleration of decay in buildings and poorer air quality. Acid rain also poses serious human health risks by contributing to heart and lung disorders such as asthma and bronchitis. Acid rain can be reduced by the regulation of industrial emissions and the adoption of energy efficiency alternatives and pollution prevention programs. Acid rain is a form of acid deposition.

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