Definition of pilot light noun from the Oxford Advanced Learner's Dictionary


pilot light

BrE BrE//ˈpaɪlət laɪt//
; NAmE NAmE//ˈpaɪlət laɪt//
(also pilot)
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a small flame that burns all the time, for example on a gas boiler, and lights a larger flame when the gas is turned on
See the Oxford Advanced American Dictionary entry: pilot light