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| Doorway
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(1) Opening in a wall meant to be closed by a door. (2) Passageway or entry into a building or room. |
| Dooryard
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The part of a yard, which is very close to the door. |
| Dopant
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A chemical element (impurity) added in small amounts to an otherwise pure semiconductor material to modify the electrical properties of the material. An n-dopant introduces more electrons. A p-dopant creates electron vacancies (holes). |
| Dope
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(1) Thick liquid or pasty substance or other material, which is used to lubricate or absorb something. (2) Paint, varnish, dressing, etc. which is used on the fabric of the wings of aircraft as protection. |
| Dope, pipe
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Lubricant compound used on seal pipe threads prior to making a threaded pipe connection. |
| Doping
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The addition of dopants to a semiconductor. |
| Doric
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The oldest and simples of the five classic architectural orders, originating in the Dorian region of ancient Greece. Ionic, Corinthian, Tuscan and Composite are the other four. |
| Doric column
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A Greek-style column with only a simple decoration around the top, usually a smooth or slightly rounded band of wood, stone or plaster. |
| Dormant period (dormancy)
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The time when a plant has naturally stopped growing and the leaves have fallen or the top growth has died down. The dormant period is usually, but not always, in winter. Compare resting period. |
| Dormer
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Roofed projection built out from a sloping roof into which a window is set to provide additional interior light and ventilation. The word dormer comes from the word dormitory, which was normally in an attic area. |
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