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| amnion |
a thin membranous sac, filled with a watery fluid, that contains the embryo of a mammal, bird, or reptile. |
| caddis fly |
a small mothlike insect found near lakes and streams that has two pairs of membranous wings. |
| capsule |
any of several kinds of cases or envelopes covering or enclosing parts of living things, such as the seed case of certain fruits, or the membranous cover of a joint or organ. [1/7 definitions] |
| cicada |
any of various large insects characterized by thin membranous wings and a shrill noise emitted by the male. |
| diaphragm |
in anatomy, a wall of muscle or membranous material separating two spaces, esp. the muscle wall separating the thorax and abdomen in mammals. [1/5 definitions] |
| dobsonfly |
a large insect with four membranous, veiny wings, whose carnivorous larvae live in water. (See hellgrammite.) |
| epicardium |
the inner layer of the thin membranous sac that surrounds the heart. (See pericardium.) |
| epithelium |
a protective, membranous layer of tissue, usu. a single layer of close-knit cells, that lines the cavities and the outside of an organism. |
| film |
a thin, membranous layer. [1/11 definitions] |
| foramen |
an opening, perforation, or short passage through a bony or membranous anatomical structure or plant ovule. |
| involucre |
a usu. membranous casing or covering. [1/2 definitions] |
| membrane bone |
a bone that is formed in membranous tissue, rather than in cartilage. |
| neuropterous |
relating or belonging to a group of insects that have four membranous, lacy wings, such as the lacewing and ant lion. |
| orthopteran |
any of a large order of plant-eating insects, including crickets, grasshoppers, and cockroaches, that have hard leathery forewings and membranous hind wings. |
| pericardium |
in vertebrates, the membranous sac enclosing the heart. |
| perilymph |
the fluid between the bony and membranous labyrinths of the ear. |
| pleura |
the thin membranous sac that envelops each lung and lines the thorax in mammals. |
| pterosaur |
a flying reptile of the Mesozoic era characterized as having a birdlike beak and membranous wings supported by an exceptionally long fourth digit of each forelimb. |
| thylakoid |
a disc-shaped, membranous sac that is the site of the light-dependent reactions of photosynthesis in cyanobacteria and the chloroplasts of green plants. |
| vacuole |
a membranous enclosure within a cell that contains substances isolated from the protoplasm, such as dissolved acids. [1/2 definitions] |
| valve |
an anatomical structure, such as a membranous flap, that controls the flow of a body fluid or keeps it flowing in only one direction. [1/5 definitions] |
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