| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Horizontal borer | Mining | A machine, making holes from 2 to 6 in (5.08 to 15.24 cm) in diameter, used for drilling overburden at open cut coal mines. Bits are of the auger or winged types. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
