proto-chromium
The proto-metal form of chromiumThe proto-metal form of chromium.
Meaning
1 senses(obsolete, uncountable)The proto-metal form of chromium.
Origin
proto- + chromiumproto- + chromium
Wiktionary, CC BY-SA 4.0 · source
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable