Definition of Long wall
(Coal Mining)
a
working
in
which
the
whole
seam
is
removed
and
the
roof
allowed
to
fall
in
,
as
the
work
progresses
,
except
where
passages
are
needed
.
See also:
Long
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lonesomeness
Long
Long clam
Long cloth
Long clothes
Long division
Long dozen
Long home
Long measure
Long meter
Long Parliament
Long pepper
Long price
Long primer
Long purple
Long purse
Long roll
Long sea
Long suit
Long tom
long-acting
Long-armed
Long-boned shad
Long-breathed
long-dated
long-distance
Long-drawn
long-drawn-out
long-faced
long-familiar
long-haired
Long-horned
long-lasting
long-legged
Long-legged plover
Long-lived
long-play
long-playing
long-range
long-run
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