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a. either of two players who defend the area furthest back in the field
b. a play in which the offensive team causes the ball to cross its own goal line and then grounds the ball behind that line, scoring two points for the opposing team
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Methods and techniques of avoiding accident or disease.
A locking or cut-off device that prevents a weapon or missile from being fired accidentally.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
elevator car safety, counterweight safety
A mechanical device attached to an elevator car frame or to the frame of the counterweight; slows down, stops, and holds the car or counterweight in the event of excessive speed or free fall of the car, or if the wire ropes slacken, break, or pull out of their fastenings.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
intrinsic safetyInherently safe machinery, electrical and electronic systems that do not contain hazardous materials, high voltages, bare terminals or other potentially dangerous parts that can cause injury to a human. See safety.
machine safetySafeguards that are applied to both machinery and the operators who work with them. Examples are interlocks that stop a motor if a person gets too close, guards that cover moving gears and blades and goggles and protective clothing. See safety.
safety instrumented systemA system that protects a manufacturing or operating process. Conforming to the IEC 61511 or 61508 standards, such a system is designed to shut itself down or change to a reduced operational state in the event of failure or hazardous situation. Also called "ESD system," "emergency shutdown," "safety shutdown" and "emergency trip system." See safety.
safety integrity levelA measurement of the effectiveness of safety systems based on the probability of tolerable incidents that can occur within a number of processing demands. For example, SIL level 4 means that for every 10,000 demands on the system, there could be one incident. See safety instrumented system.
SIL From To
1 1 in 10 1 in 100
2 1 in 100 1 in 1,000
3 1 in 1,000 1 in 10,000
4 1 in 10,000 1 in 100,000
safety networkA network used in industrial and process control industries that provides real-time response to signals for turning off machinery due to a malfunction or operator accident. See safety.
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