pleura
Each of a pair of smooth serous membranes which line the thorax and envelop the lungs in humans and other mammals.
Other meanings
A lateral part in an animal body or structure.
Word history
From Medieval Latin "pleura".
Where this comes from
This definition is adapted from “pleura” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.