smoke detector

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smoke detector

[′smōk di‚tek·tər]
(engineering)
A photoelectric system for an alarm when smoke in a chimney or other location exceeds a predetermined density.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

smoke detector

A device for sensing the presence of smoke in a building—usually by means of a photoelectric detector, ionization detector, ultraviolet flame detector, or a heat detector.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.