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Pertaining to the Pleuronectidæ, or Flounder family.

Of or pertaining to the pleura and pericardium.

Pleuropneumonia.

Of or pertaining to the pleural and peritoneal membranes or cavities, or to the pleuroperitoneum.

The pleural and peritoneal membranes, or the membrane lining the body cavity and covering the surface of the inclosed viscera; the peritoneum; -- used especially in the case of those animals in which the body cavity is not divided.

Inflammation of the pleura and lungs; a combination of pleurisy and pneumonia, esp. a kind of contagions and fatal lung plague of cattle.

A group of Isectivora, including the colugo.

gated elliptical shape, but having the sides slightly curved in the form of a letter S. Pleurosigma angulatum has very fine striations, and is a favorite object for testing the high powers of microscopes.

The antero-lateral piece which articulates the sternum of birds.

A species of tetanus, in which the body is curved laterally. Quain. Dunglison.

Any marine gastropod belonging to Pleurotoma, and ether allied genera of the family Pleurotmidæ. The species are very numerous, especially in tropical seas. The outer lip has usually a posterior notch or slit.

The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods.

air; having the properties of an elastic fluid; gaseous; opposed to dense or solid. The pneumatical substance being, in some bodies, the native spirit of the body. Bacon.

The state of being pneumatic, or of having a cavity or cavities filled with air; as, the pneumaticity of the bones of birds.

That branch of science which treats of the mechanical properties of air and other elastic fluids, as of their weight, pressure, elasticity, etc. See Mechanics.

A combining form from Gr. wind, air, breath, respiration; as, pneumatograph, pneumatology.

A distention of the scrotum by air; also, hernia of the lungs.

A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.

A tracing of the respiratory movements, obtained by a pneumatograph or stethograph.

An instrument for recording the movements of the thorax or chest wall during respiration; -- also called stethograph.