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geobiology

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(jē″ō-bī-ol′ŏ-jē) [Gr. gē, earth + biology] The study of terrestrial life. geobiologic, geobiological (jē″ŏ-bī″ŏ-loj′ik, jē″ŏ-bī″ŏ-loj′i-kăl), adj.

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geochemical disease

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(jē″ō-kem′ĭ-kăl) Any geographically limited disease that affects people who live where there are unusually high concentrations of specific minerals in the air, soil, or water that are not found in high concentrations elsewhere. Examples include fluorosis (in Sri Lanka) and iodine deficiency (in many tropical countries and in the north central U.S.).

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geocoding

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(jē′ō-kōd″ing) Assigning geographical coordinates (longitudes and latitudes) to a location identified by other means, as during an outbreak of a disease.

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geode

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(jē′ōd) [Gr. geodes, earthlike] A subchondral (bony) cyst occasionally found in patients with rheumatological illnesses.

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geographical distribution of disease

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The relationship between the prevalence of a disease and specific geographical and environmental conditions. For example, goiter occurs in inland areas of the U.S. that are deficient in iodine; pulmonary hypertension occurs in those who live at high altitudes; certain infectious diseases, such as leprosy, leishmaniasis, and Chagas disease, are endemic in specific tropical or subtropical areas.

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geohelminth

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(jē″ŏ-hel′minth″) [Gr. gē, earth + helminth] Any of the tropical soil worms, including ascaris, hookworm, and Trichuris trichiura (whipworm), that may parasitize human beings and other organisms.

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geophagia, geophagism, geophagy

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(jē-ō-fā′jē-ă, -ŏf′ă-jĭzm, -ŏf′ă-jē) [″ + phagein, to eat] A condition in which the patient eats inedible substances such as chalk, clay, or earth. SEE: pica.

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geophilic

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(jē″ŏ-fil′ik) [Gr. gē, the Earth + -philic] Of some bacteria and fungi, growing or thriving in soil.

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georeference

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(jē″ō-ref′(ĕ-)rĕns) [Gr. gē, gaia, earth + reference] To determine the precise location of an object or an event by defining its spatial coordinates.

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geotaxis

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(jē″ō-tak′sĭs) [Gr. gē, earth + taxis] Geotropism.

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Geotrichum

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(jē-ŏt′rĭ-kŭm) A genus of fungi belonging to the family Endomycetaceae; the causative agent of geotrichosis. Geotrichosis is usually acquired by ingestion or inhalation, and occasionally after trauma. Bronchial, pulmonary, and systemic infections occur.

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geotropism

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(jē″ah′trŏ-pizm) [Gr. gē, earth + tropism] The influence of gravity on living organisms. SYN: geotaxis. SEE: tropism.

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geranium

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(jĕ-rān′ē-ŭm) [L. geranium fr. Gr. geranion] 1. Any of more than 400 species of plants of the genus Geranium. 2. A flowering plant, Pelargonium graveolens, native to southern Africa, whose essential oils are marketed as insect repellents but whose effectiveness is not well demonstrated.

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GERD

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gastroesophageal reflux disease.

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Gerdy, Pierre Nicholas

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(zher-dē′, gĕr′dē) Fr. ...

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