- Lung-expanding muscle - Muscle used in breathing - navel region would die if ram could speak - A dividing membrane or thin partition, commonly with an
opening through it. - The muscular and tendinous partition separating the
cavity of the chest from that of the abdomen; the midriff. - A calcareous plate which divides the cavity of certain
shells into two parts. - A plate with an opening, which is generally circular,
used in instruments to cut off marginal portions of a beam of light, as
at the focus of a telescope.