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a. The principal entry or set of entries driven through the mine from
which cross entries, room entries, or rooms are turned.
Federal Mine Safety
b. A term used in the United States for the principal horizontal gallery
giving access to an underground mine and used for haulage, ventilation,
etc. Where two entries are driven in parallel, the term "double entry" is
used. With three parallel entries, the term "triple entry" is used.
Nelson
c. An entry driven at right angles with the face slips of the coal.
See also: entryd. A main haulage road. See also:
main road
Source:
Dictionary of Mining, Mineral, and Related Terms
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