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| Border
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An edge or dividing line. |
| Bore
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To make a hole by drilling. |
| Bored deadlock
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Lock with a bolt, which slides into the receptacle in the door jamb when the key is turned. |
| Boring bar
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Holder for the boring bit used to bore holes in metal. The chuck of the lathe grabs on to the shaft, which holds the bar. The boring bar is placed at a right angle to the arbor and, when the arbor is rotated, the bit in the boring bar cuts the circle into the metal. The boring bar in the arbor is slid to change the space between the cutting tool and the arbor, which adjusts the size of the circle. |
| Boring jig
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A jig maintains the needed placement between a drill and the material so that the hole is properly aligned. |
| Boring log
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Record of the information gained about the soil, which was removed from an excavation site. |
| Boring test
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Soil analysis taken by boring holes into the ground to remove samples. |
| Boron
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The chemical element commonly used as the dopant in solar photovoltaic device or cell material. |
| Borough
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A section of a city having authority over local matters. |
| Borrow
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Material used for grading, usually sand or gravel. Borrow Pit A hole at a site where soil has been excavated for use elsewhere. Also called a borrow site. |
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