Etymology
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flashlight (n.)

also flash-light, 1886, "on-and-off signal light in a light-house, etc.," from flash (v.) + light (n.). As the word for a photographer's light-emitting preparation, 1892 (flash-lamp in this sense is by 1890). From 1905 as as a handheld, pocket-sized electric illumination device, the American English word for what the British might call an electric torch.

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Definitions of flashlight

flashlight (n.)
a small portable battery-powered electric lamp;
Synonyms: torch
From wordnet.princeton.edu