noun, plural pleurae [ploor-ee] , for 1.
Anatomy, Zoology. a delicate serous membrane investing each lung in mammals and folded back as a lining of the corresponding side of the thorax.
plural of pleuron.

1655–65; < Neo-Latin < Greek pleurá (singular) side, rib Unabridged


noun, plural pleura [ploor-uh] . Entomology.
the lateral plate or plates of a thoracic segment of an insect.

1700–10; < Greek pleurón rib, (plural) side Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pleura (ˈplʊərə)
n , pl pleurae
1.  the thin transparent serous membrane enveloping the lungs and lining the walls of the thoracic cavity
2.  the plural of pleuron
[C17: via Medieval Latin from Greek: side, rib]

pleuron (ˈplʊərɒn)
n , pl pleura
the part of the cuticle of arthropods that covers the lateral surface of a body segment
[C18: from Greek: side]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pleura pleu·ra (plur'ə)
n. pl. pleu·rae (plur'ē)
The thin serous membrane that envelops each lung and folds back to make a lining for the chest cavity.

pleu'ral adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pleura   (plr'ə)  Pronunciation Key 
Plural pleurae (plr'ē)
A membrane that encloses each lung and lines the chest cavity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


membrane lining the thoracic cavity (parietal pleura) and covering the lungs (visceral pleura). The parietal pleura folds back on itself at the root of the lung to become the visceral pleura. In health the two pleurae are in contact. When the lung collapses, however, or when air or liquid collects between the two membranes, the pleural cavity or sac becomes apparent (see pleurisy). There are actually two pleural cavities, the right and the left; each constitutes a closed unit not connected to the other. The glistening surface of the pleura is made up of a sheet of flat cells, the mesothelium, which covers an underlying layer of loose elastic tissue. The pleura exudes a thin fluid that keeps it moist and lubricated.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Fluid in the pleura is withdrawn using a long thin needle inserted between the
The lungs are two spongy organs surrounded by a thin, moist membrane called the
The lungs are two spongy organs surrounded by a thin moist membrane called the
Below, it rests in a depression on the first rib and upon the pleura.
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