What does "cobalt" mean?
A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal.
Cobalt
/ˈkəʊ.bɒlt/ name, noun
name, noun ·Uncommon ·Advanced level
Meaning at a glance
- Primary sense: A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal.
- Grammar: cobalt is listed as name, noun.
- Nearest alternatives: co, atomic number 27, blu, blue.
- Useful contrasts: nonblue, noncobalt, nonmetal.
- Usage evidence: Some of the cobalt used in phone and laptop batteries is dug out by hand in Congo.
How to use "cobalt"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "cobalt" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "cobalt" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "cobalt" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "cobalt" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "cobalt" is acting as name, noun in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "co" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "cobalt", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal. uncountable, usually
- 2 a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition wordnet
- 3 Cobalt blue. uncountable, usually
"And although we’ve certainly seen a variety of blue shades — from periwinkle to cobalt and even Dean Cain’s indigo-washed costume from the 1990’s TV show “Lois & Clark” — Superman’s uniform is still instantly recognizable across generations. In fact, there is only one film — Zack Snyder’s 2013 “Man of Steel” — in which Superman does not wear his iconic red belted trunks."
Proper Noun
- 1 A village in Connecticut.
- 2 A town in Ontario.
- 3 An unincorporated community in Idaho.
Synonyms
All synonymsExample
"Some of the cobalt used in phone and laptop batteries is dug out by hand in Congo."
Common questions
What is a synonym for "cobalt"?
Common synonyms include: co, atomic number 27, blu, blue, bluish, cobalt blue.
How do you use "cobalt" in a sentence?
Some of the cobalt used in phone and laptop batteries is dug out by hand in Congo.
How do you pronounce "cobalt"?
Pronounced /ˈkəʊ.bɒlt/.
Etymology
From German Kobalt, formerly also Kobald, ‑olt, ‑old, ‑elt, ‑el, apparently the same word as Kobold (“goblin”), from Middle High German, which became also a Harz Mountains silver miners’ term for rock laced with arsenic and sulfur, so called because it degraded the ore and made the miners ill. Doublet of kobold.