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| Bulb
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(1) The transparent or opaque sphere in an electric light that the electric light transmits through. (2) The thickened underground storage organ of the group of perennials which includes daffodils and tulips. |
| Bulb turbine
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A type of hydro turbine in which the entire generator is mounted inside the water passageway as an integral unit with the turbine. These installations can offer significant reductions in the size of the powerhouse. |
| Bulb-tee
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A steel reinforcing member used when constructing pre-stressed, poured gypsum decks. When the gypsum is poured, it surrounds the Bult-Tee. |
| Bulbil
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An immature small bulb formed on the stem of a plant; e.g Lily. |
| Bulblet
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An immature small bulb formed at the base of a mature bulb; e.g Hyacinth. |
| Bulk density
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The weight of a material per unit of volume compared to the weight of the same volume of water. |
| Bulk unit weight
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Weight of concrete aggregate that fills a 1 cubic foot container. |
| Bulkhead
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(1) Retaining wall designed to stop water from the ocean or another body of water. (2) Roof structure over a stairway |
| Bull float
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Flat, long handled device that is used to smooth wet concrete. |
| Bull header
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Masonry unit that ties rows of masonry together. |
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