Definition of speculum metal
: an alloy capable of taking a brilliant polish, used for making reflectors, and being commonly a hard brittle alloy of copper and tin in various ratios (such as tin 33 to copper 67) with often a little arsenic, antimony, or zinc added to improve the whiteness
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up speculum metal? Please tell us where you read or heard it (including the quote, if possible).