pleural UK /ˈplʊə.ɹəl/US /ˈplʊɹ.əl/adjective 2noun 1forms 1 adjective2 •Of, relating to, or affecting the pleura, or the sides of the thorax.The areas of lung dysventilation with an absence of alveolar air are visualized in the form of consolidations adjacent to the pleural line. — 2015 •Thin and transparent. noun1 •An internal segment of the turtle carapace. formspleurals