Noun
A
pattern
along
the
top
of
a
parapet
(
fortified
wall
),
most
often
in
the
form
of
multiple
,
regular
,
rectangular
spaces
in
the
top
of
the
wall
,
through
which
arrows
or
other
weaponry
may
be
shot
,
especially
as
used
in
medieval
European
architecture
.