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| Bonsai
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The art form of dwarfing trees by careful root and stem pruning coupled with root restriction. |
| Bonus room
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A room that can be used in many different ways, with no designated function, i.e. kitchen or bedroom. |
| Book
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Journal or Ledger or as a verb, to record an entry. |
| Book cost
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Initial purchase plus costs necessary to put the property into existing use and location, which is then depreciated (except for land costs) over the life of the asset. |
| Book value
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Cost, plus additions and minus depreciation, is the book valuation of a property. |
| Boom
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Dramatic increase in activity or prices. Rapid economic prosperity. Alternately: |
| Booster pump
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A pump for circulating the heat transfer fluid in a hydronic heating system. |
| Boot
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(1) A piece of sheet metal connecting a heating or cooling duct and a vent. (2) Lath or marker used to site grades when obstruction blocks a view. (3) Flange used around the base of a roof pipe. |
| Boot truck
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Truck that sprays the tack coat of asphalt on old asphalt before the new asphalt is installed. Tack coat is an emulsified asphalt and using it helps bond the old and new asphalt surfaces. |
| Bordeaux mixture
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Fungicide made of a combination of copper sulfate, lime and water. |
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