What is "pleuras"

Pleura \Pleu"ra\, n.; pl. L. Pleur[ae], E. Pleuras. [NL., n. fem., fr. Gr. ? a rib, the side.]

1. (Anat.)

   1. The smooth serous membrane which closely covers the lungs and the adjacent surfaces of the thorax; the pleural membrane.

   2. The closed sac formed by the pleural membrane about each lung, or the fold of membrane connecting each lung with the body wall.

2. (Zo["o]l.) Same as Pleuron.