(1):

(n. fem.) Same as Pleuron.

(2):

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

(3):

(n.) pl. of Pleuron.

(4):

(n. fem.) The smooth serous membrane which closely covers the lungs and the adjacent surfaces of the thorax; the pleural membrane.

(5):

(pl.) of Pleuron