- A membrane, especially a biomembrane.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for membrana
That she had a membrana on her, which made her uncapable of man, though for her delight she tried many.1601
On its external (posterior) surface a distinct cuticular membrane, the membrana limitans externa, early appears.
Above the ridge there appears a delicate cuticular membrane, the membrane of Corti or membrana tectoria.
The vascular sheath surrounding the lens receives the name of the membrana capsulo-pupillaris.
The membrana capsulo-pupillaris is simply a provisional embryonic structure, subserving the nutrition of the lens.