speculum metal
A mixture of around two-thirds copper and one-third tin making a white brittle alloy…A mixture of around two-thirds copper and one-third tin making a white brittle alloy that can be polished into a highly reflective surface.
Meaning
1 senses(uncountable)A mixture of around two-thirds copper and one-third tin making a white brittle alloy that can be polished into a highly reflective surface.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable
See also
neighbours in the dictionaryDictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.