| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Bell hole | Mining | 1: A bell-shaped hole dug beneath a pipeline to provide room for use of tools. (references) | |
| 2: Kettle bottom: a smooth, rounded piece of rock, cylindrical in shape, which may drop out of the roofof a mine without warning. Source: European Union. (references) | |||
| Bell hole | Transportation | A hole dug along the side of pipelines or in a trench to allow room for workmen to make a joint in the pipe, repairs to the pipe, welding steel pipe, or replacing pipe. In the broad sense, any hole, other than a ditch, opened for pipeline work. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
