Holmes light

Holmes light

noun
a canister, attached to a life buoy or float, containing calcium carbonate and calcium phosphide, which ignite spontaneously on contact with the water, emitting conspicuous fire and smoke.

Origin:
probably from the surname Holmes
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Holmes light is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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