pneumatic bone
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pneumatic bone — noun Any bone, such as the mastoid process or those of the birds, that contains many hollow cells full of air … Wiktionary
pneumatic — 1. Relating to air or gas, or to a structure filled with air. 2. Relating to respiration. [G. pneumatikos] * * * pneu·mat·ic n(y)u̇ mat ik adj of, relating to, or using gas (as air): as a) moved or worked by air pressure b) adapted for holding or … Medical dictionary
Bone — is the substance that forms the skeleton of the body. It is composed chiefly of calcium phosphate and calcium carbonate. It also serves as a storage area for calcium, playing a large role in calcium balance in the blood. The 206 bones in the body … Medical dictionary
pneumatic space — a portion of bone occupied by air containing cells; applied especially to spaces in the bones of the head constituting the paranasal sinuses … Medical dictionary
os pneumaticum — [TA] pneumatic bone: a bone that contains air filled cavities or sinuses … Medical dictionary
Origin of avian flight — The Berlin Archaeopteryx, one of the earliest known birds. Evolution of flight redirects here. See also flying and gliding animals and insect flight. Around 350 BCE, Aristotle and other philosophers of the time were attempting to explain the… … Wikipedia
bird — birdless, adj. /berrd/, n. 1. any warm blooded vertebrate of the class Aves, having a body covered with feathers, forelimbs modified into wings, scaly legs, a beak, and no teeth, and bearing young in a hard shelled egg. 2. a fowl or game bird. 3 … Universalium
Bird — /berrd/, n. Larry, born 1956, U.S. basketball player. * * * I Any of the warm blooded, beaked vertebrates of the class Aves, including more than 9,600 living species. A covering of feathers distinguishes birds from all other animals. Birds have a … Universalium
keyboard instrument — ▪ music Introduction any musical instrument on which different notes can be sounded by pressing a series of keys, push buttons, or parallel levers. In nearly all cases in Western music the keys correspond to consecutive notes in the… … Universalium
History of the bicycle — Vehicles for human transport that have two wheels and require balancing by the rider date back to the early 19th century. The first means of transport making use of two wheels, and thus the archetype of the bicycle, was the German draisine dating … Wikipedia
