Definition of Compound
Quick Meaning of Compound
In chemistry, two or more elements joined together as one substance. Or in language, two words put together to make a new word (like 'notebook' = 'note' + 'book').
Detailed Definition of Compound
A substance formed by the chemical combination of two or more elements in definite proportions; or a word made up of two or more smaller words combined.
How to Pronounce Compound
Stress pattern: Oo (2-syllable word).
Tip: As a noun, stress the first syllable: KOM-pound. As a verb, stress the second syllable: kom-POUND.
Watch out: Learners sometimes stress the second syllable for the noun (kom-POUND) when it should be first. As a verb, the second syllable is stressed correctly.
Origin and Etymology of Compound
From Latin 'componere' (to put together). 'Com-' (together) + 'ponere' (to put). Used in chemistry since 17th century; in grammar since Middle English.
How to Use Compound in a Sentence
Each example shows “compound” with a CEFR level so learners can pick examples that match their fluency.
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“Water is a compound made of hydrogen and oxygen atoms.”
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“The word 'basketball' is a compound noun formed from two independent words.”
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“Scientists discovered a new compound that may help treat cancer.”
Synonyms and Antonyms of Compound
Common Synonyms for Compound
Smart Synonyms for Compound — When to Use Each
- mixture
- Physical combination without chemical bonds
- substance
- General term for pure or mixed material
- blend
- Informal term suggesting combined parts
Common Collocations with Compound
These phrases pair with “compound” in everyday English:
- chemical compound
- organic compound
- inorganic compound
- compound word
- compound interest
Common Mistakes When Using Compound
Even fluent speakers slip up with “compound”. Here’s how to avoid the most common errors:
- ✗ Wrong: The water and salt mixture is a compound.
- ✓ Correct: The water and salt mixture is a mixture, not a compound.
- Why: Mixing is physical; compounds require chemical bonding with fixed proportions.
- ✗ Wrong: A compound makes up of two words.
- ✓ Correct: A compound is made up of two words. / A compound consists of two words.
- Why: 'Makes up of' is grammatically incorrect; use 'is made up of' or 'consists of'.
- ✗ Wrong: The compounds of the medicine help patients.
- ✓ Correct: The compounds in the medicine help patients.
- Why: Use 'compounds in' not 'compounds of' when referring to ingredients of a substance.
Words Confused With Compound
- Compound vs Mixture: A mixture is physical; a compound is chemical with fixed proportions
Other Forms of Compound
Frequently Asked Questions About Compound
What is the meaning of "Compound"?
In chemistry, two or more elements joined together as one substance. Or in language, two words put together to make a new word (like 'notebook' = 'note' + 'book').
How do you pronounce "Compound"?
The IPA is /ˈkɑːmpaʊnd/. As a noun, stress the first syllable: KOM-pound. As a verb, stress the second syllable: kom-POUND.
What part of speech is "Compound"?
"Compound" is a noun at C1 level (Common European Framework).
What are synonyms for "Compound"?
Common synonyms include mixture, substance, combination.
How do you use "Compound" in a sentence?
For example: "Water is a compound made of hydrogen and oxygen atoms."