speculum-alloy

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noun

any of several bronze alloys with a high tin content, often containing other materials, as silver, brass, lead, zinc, or arsenic, used for making mirrors and reflectors.

Also called speculum, speculum alloy.

Origin:
1790–1800

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To speculum-alloy

Collins

World English Dictionary

speculum metal

—n
	a white hard brittle corrosion-resistant alloy of copper (55--70 per cent) and tin with smaller amounts of other metals. It takes a high polish and is used for mirrors, lamp reflectors, ornamental ware, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10

Speculum-alloy is always a great word to know.

So is doohickey. Does it mean:

a gadget; dingus; thingumbob.

a stew of meat, vegetables, potatoes, etc.

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speculum metal