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National Forest System

(Encyclopedia)National Forest System, federally owned reserves, c.191 million acres (77.4 million hectares), administered by the Forest Service of the U.S. Dept. of Agriculture. The system is made up of 155 nationa...

autonomic nervous system

(Encyclopedia)autonomic nervous system: see nervous system. ...

life support system

(Encyclopedia)life support system: see artificial life support; Life Support for Human Spaceflight under space science. ...

parasympathetic nervous system

(Encyclopedia)parasympathetic nervous system: see nervous system. ...

sympathetic nervous system

(Encyclopedia)sympathetic nervous system: see nervous system. ...

transdermal delivery system

(Encyclopedia)transdermal delivery system: see skin patch. ...

Space Transportation System

(Encyclopedia)Space Transportation System, official designation for the U.S. space shuttle. ...

central nervous system

(Encyclopedia)central nervous system: see nervous system. ...

pitot static system

(Encyclopedia)pitot static system pētōˈ [key], device for measuring the rate at which a fluid flows. Among the principal applications of the device are an airspeed indicator for aircraft and a distance and speed...

ring, mathematical system

(Encyclopedia)ring, in mathematics, system consisting of a set R of elements and two binary operations, such that addition makes R a commutative group and multiplication is associative and distributes over addition...