easy
Lemon juice contains acid.
What does Acid mean?
Acid is a sour chemical substance.
Dictionary definition
A chemical substance that can taste sour and may react with other substances.
Example sentences
Acid in a sentence
medium
The science class tested whether a liquid was an acid.
hard
Some acids must be handled carefully because they can react strongly.
Writing practice
Ready to write your own? Study the examples, then practice acid in a sentence with Sentence Builder checklist feedback.
Quick practice
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Practice the meaning of Acid
Answer three quick questions about its meaning and related words.
Question 1 of 3
Practice 1
What is acid?
An acid is a chemical substance that may taste sour and react with other substances.
Practice 2
Which word is closest in meaning to acid?
Sour Substance is close in meaning to acid in this dictionary entry.
Practice 3
Which word is an antonym of acid?
Base contrasts with acid in this dictionary entry.
Practice complete
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Pronunciation coach
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Acid
Voice settings
Sounds like
as · id · strongest beat: as
Tap each sound part, then blend the whole word together.
Learn
WordAcid.
Partnoun, adjective.
MeaningAcid is a sour chemical substance.
ExampleExample: Lemon juice contains acid.
Word breakdown
2 syllables. Say each part, then blend the word.
- Syllables
- as · id
- Strongest beat
- as
- Ending
- id
- Tip
- Put a little extra energy on as.
Your turn
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Nice work—you practiced acid.
Synonyms
Words like Acid
sour substanceA simple phrase for an acid in food or science.
chemicalUse for a substance studied in science.
Antonyms
Opposite words
baseIn chemistry, a base is different from an acid.
alkaliA type of base that can neutralize acids.
Synonym practice
Want to practice acid synonyms in context? Try a Synonym Search question like "The lemon juice had a mild acid taste," then compare close word choices. Practice acid synonyms.
Word family
Acid word family
Base word
acid
adjective
acidic
Having the qualities of an acid.
noun
acidity
The level or quality of being acidic.
Related words
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Student support
Understand Acid
Hint for students
Acid is a sour chemical substance.
Common mix-up
Acid is not the same as base. Acid means acid is a sour chemical substance.
Try it in class or at home
Read this model sentence: The science class tested whether a liquid was an acid. Clue words: science, class, tested. Underline clue words that show why acid fits instead of base. Now write one new sentence that shows acid without using the word acid. Ask: Does my sentence clearly show acid?
Teacher prompt
Ask students to explain this model sentence: "The science class tested whether a liquid was an acid." Why does acid fit better than base?
Learning activities
Practice Acid and explore more word games
Cards labelled “Practice ACID” keep this word in focus. Explore cards open games with other words.
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