| A piece of tile cut or shaped like the letter L.
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| A bond, secured by the general contractor, which guarantees that the costs for labor and materials for the project will be paid.
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| A trade union.
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| A case, box, or piece of furniture with sets of drawers or shelves, with doors, primarily used for storage, used in a place or area for scientific studies or commercial and institutional laboratories and testing facilities.
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| A level surface in a laboratory where equipment is placed and kept and where work may be performed.
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| Devices and tools used in laboratory work.
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| A heating device in a laboratory.
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| A device in a laboratory in which waste materials are burned.
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| An apparatus used in a laboratory for the maintenance of controlled conditions.
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| A surface on which laboratory materials and devices are kept and used.
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| A room or building equipped for physical or chemical testing, experimentation, or analysis.
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| A natural resin secreted by certain insects which live on the sap of trees in India and other Oriental countries; marketed in various forms, such as seed lac, button lac, and shellac.
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| Undue delay in asserting ones legal rights, resulting in loss of the rights.
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| A sometimes colored liquid made of shellac dissolved in alcohol, or of synthetic substances, that dries to form a hard protective coating.
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| A ceiling made up of vaults or recessed panels.
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| A recessed panel in a ceiling.
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| A prefabricated reinforcement designed for embedment in the horizontal mortar joints of masonry; parallel deformed side rods connected in a single plane, by cross wires, thus forming a ladder-like design.
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| A cage-like structure surrounding a wall-mounted ladder for safety.
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| A horizontal round member used as a step on a ladder.
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| A horizontal flat member used as a step on a ladder.
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| see Pool Ladder.
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| A frame consisting of two parallel side pieces connected by rungs at suitable distances to form steps on which persons may climb up or down.
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| A large diameter rod with a square or hexagonal head.
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| A large diameter wood screw with a square or hexagonal head.
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| Delay in response.
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| see Double-Up.
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| see Double-Up.
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| A layer of weak and nondurable material containing cement and fines from aggregates, brought by bleeding water to the top of overwet concrete, the amount of which is generally increased by overworking or overmanipulating concrete at the surface by improper finishing or by job traffic; effluorescence.
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| see Natural Asphalt.
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| Pigment made by putting an organic dye on a base of fine particles of inert or translucent pigment.
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