'Spark arrester' definitions:

Definition of 'spark arrester'

noun

Electrical device to reduce sparking when electrical contacts are opened or closed

noun

A wire net to stop sparks from an open fireplace or smokestack [syn: spark arrester, sparker]

From: GCIDE

Spark \Spark\, n. [OE. sparke, AS. spearca; akin to D. spark, sperk; cf. Icel. spraka to crackle, Lith. sprag["e]ti, Gr. ? a bursting with a noise, Skr. sph?rj to crackle, to thunder. Cf. Speak.]
1. A small particle of fire or ignited substance which is emitted by a body in combustion. [1913 Webster]
Man is born unto trouble, as the sparks fly upward. --Job v. 7. [1913 Webster]
2. A small, shining body, or transient light; a sparkle. [1913 Webster]
3. That which, like a spark, may be kindled into a flame, or into action; a feeble germ; an elementary principle. "If any spark of life be yet remaining." --Shak. "Small intellectual spark." --Macaulay. "Vital spark of heavenly flame." --Pope. [1913 Webster]
We have here and there a little clear light, some sparks of bright knowledge. --Locke. [1913 Webster]
Bright gem instinct with music, vocal spark. --Wordsworth. [1913 Webster]
Spark arrester, a contrivance to prevent the escape of sparks while it allows the passage of gas, -- chiefly used in the smokestack of a wood-burning locomotive. Called also spark consumer. [U.S.] [1913 Webster]