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Dictionary Suite
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]