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achlorhydria

Overview page. Subjects: medicine and health.

n. absence of hydrochloric acid in the stomach. Achlorhydria that persists despite large doses of histamine is associated with atrophy of the lining (mucosa) of the stomach. In...

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acholia

Overview page. Subjects: medicine and health.

n. absence or deficiency of bile secretion or failure of the bile to enter the alimentary canal (for example, because of an obstructed bile duct).

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acholuria

Overview page. Subjects: medicine and health.

n. absence of the bile pigments from the urine, which occurs in some forms of jaundice (acholuric jaundice). —acholuric adj.

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ache

Overview page. Subjects: dentistry.

A dull persistent pain.

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achondroplasia

Overview page. Subjects: medicine and health — chemistry.

A form of dwarfism (chondrodystrophia fetalis) in which there is a failure of endochondral ossification caused by an autosomal dominant mutation in the gene for the fibroblast growth factor...

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achromatopsia

Overview page. Subjects: psychology — medicine and health.

n. the inability to differentiate different shades of colour. Such complete colour blindness is very rare and is usually associated with poor visual acuity, nystagmus, and...

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achromotricia

Overview page. Subjects: medicine and health.

Loss of hair colour. One of the signs of pantothenic acid deficiency in animals, but there is no evidence that pantothenic acid affects hair colour in human beings.

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achylia

Overview page. Subjects: medicine and health.

(ă-ky-liă)

absence of secretion. a. gastrica a nonsecreting stomach whose lining (mucosa) is atrophied.

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achyllodonia

Overview page. Subjects: sports and exercise medicine.

A pain felt in and around the attachment of the Achilles tendon in the heel-bone.

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aciclovir

Overview page. Subjects: clinical pharmacology and therapeutics.

A nucleoside analogue (hydroxyethoxymethylguanine) with antiviral properties against both type 1 and 2 herpes virus and varicella-zoster virus. The drug is converted to the monophosphate by...

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