Definition of Caisson
Cais´son
n.
1.
(Mil.)
A
chest
to
hold
ammunition
.
2.
A
water-tight
box
,
of
timber
or
iron
within
which
work
is
carried
on
in
building
foundations
or
structures
below
the
water
level
.
3.
(Arch.)
A
sunk
panel
of
ceilings
or
soffits
.
Pneumatic caisson
(Engin.)
a
caisson
,
closed
at
the
top
but
open
at
the
bottom
,
and
resting
upon
the
ground
under
water
.
The
pressure
of
air
forced
into
the
caisson
keeps
the
water
out
.
Men
and
materials
are
admitted
to
the
interior
through
an
air
lock
.
See
Lock
.
Related Words
coffer
,
lacuna
,
panel
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