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DACRYOCYSTORHINOSTOMY

A surgical procedure which restores the flow of tears into the nose in the case of obstruction of the nasolacrimal duct.

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DACTYLITIS

A painful inflammation of the fingers or toes as a result of sickle cell anemia or certain infectious diseases.

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DADO

A border (below waist height) around the lower part of the wall of a room that is usually different in color or has a different covering than the rest of the wall.

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DAFT LAMB DISEASE

Rare disease of sheep and goats induced by a togavirus. Pregnant ewes will often experience spontaneous abortion or give birth to weak lambs that develop long coat later in life. Lambs are usually deformed and walk un-coordinatedly as a result of chronic contraction of muscles.

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DAIRY PRODUCT

Food product made from milk.

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DALAPON

A selective herbicide, with chemical formula C3H4Cl2O2.

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DALRADIAN SERIES

Very thick and diverse succession of sedimentary and volcanic rocks that underwent regional metamorphosis. They are characteristic for Scottish High

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DALTON'S ATOMIC THEORY

Chemical theory which states that matter consists of indivisible particles called atoms, that neither can be created or destroyed, and that atoms of different elements have the same properties. Compounds form due to chemical action (attraction) between atoms, which combine in simple proportions.

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DALTON'S LAW OF PARTIAL PRESSURES

Law which states that the pressure of a mixture of gases equals the sum of the partial pressures of the gases in the mixture.

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DAMP-PROOF COURSE

A layer of impervious material laid in the foundation walls of building near the ground to prevent rising of moisture via capillary attraction. Layer is usually made of plastic or bituminous sheeting. This method can also be used for door and window openings, in chimneys and for parapet walls.

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