元となった辞書の項目
iris diaphragm
noun
An
adjustable
diaphragm
by
which
the
diameter
of
an
approximately
circular
opening
may
be
controlled,
as
for
regulating
the
aperture
of
a
lens;
it
consists
of
a
number
of
movable
thin
curved
plates
fastened
at
regular
intervals
around
the
inside
of
a
ring,
the
positions
of
which
are
simultaneously
adjusted
by
a
single
knob
on
the
outside
of
the
lens.
It
is
used
in
cameras
and
microscopes.
意味（1）
An
adjustable
diaphragm
by
which
the
diameter
of
an
approximately
circular
opening
may
be
controlled,
as
for
regulating
the
aperture
of
a
lens;
it
consists
of
a
number
of
movable
thin
curved
plates
fastened
at
regular
intervals
around
the
inside
of
a
ring,
the
positions
of
which
are
simultaneously
adjusted
by
a
single
knob
on
the
outside
of
the
lens.
It
is
used
in
cameras
and
microscopes.
