What does "caustic" mean?
Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.
Caustic
/ˈkɔːstɪk/ adj, noun, slang
adj, noun, slang ·Common ·Middle school level
Meaning at a glance
- Primary sense: Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.
- Grammar: caustic is listed as adj, noun, slang.
- Nearest alternatives: abrasive, abrasive tone, acerb, acerb.
- Useful contrasts: gentle person, soave, tongue-in-cheek remarks.
- Usage evidence: Though common in cleaning products, ammonia is caustic.
How to use "caustic"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "caustic" 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 "caustic" 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 "caustic" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "caustic" 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 "caustic" is acting as adj, noun, slang 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 "abrasive" 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 "caustic", 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 Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic. countable, uncountable
"The association of the heavenly bodies with known metals and also with human organs and destinies goes back to ancient Chaldea, the land of astrologers. In Chaucer’s words: ‘The seven bodies eek, lo hear anon. Sol gold is, and Luna silver we declare; Mars yron, Mercurie is quyksilver; Saturnian leed; and Jubitur is tyn, and Venus coper, by my fathers kyn.’ […] Corresponding names were bestowed upon salts of these metals by the alchemists, and some of them have persisted down to the present day. Some examples are lunar caustic (silver nitrate); vitriol of Venus (copper sulphate); sugar of Saturn (lead acetate); and vitriol of Mars, or Martial vitriol (ferrous sulphate)."
- 2 the envelope of light rays reflected or refracted by a curved surface or object wordnet
- 3 The envelope of reflected or refracted rays of light for a given surface or object. countable, uncountable
- 4 any chemical substance that burns or destroys living tissue wordnet
- 5 The envelope of reflected or refracted rays for a given curve. countable, uncountable
Show 1 more definition
- 6 Caustic soda. informal, uncountable
Adjective
- 1 Capable of burning, corroding or destroying organic tissue.
- 2 Sharp, bitter, cutting, biting, and sarcastic in a scathing way. usually
""How now!" said Scrooge, caustic and cold as ever."
Adjective
- 1 of a substance, especially a strong acid; capable of destroying or eating away by chemical action wordnet
- 2 harsh or corrosive in tone wordnet
Example
"Though common in cleaning products, ammonia is caustic."
Common questions
What is a synonym for "caustic"?
Common synonyms include: abrasive, abrasive tone, acerb, acerb, acerbate, acerbic.
How do you use "caustic" in a sentence?
Though common in cleaning products, ammonia is caustic.
How do you pronounce "caustic"?
Pronounced /ˈkɔːstɪk/.
Etymology
From the Latin causticus (“burning”), from Ancient Greek καυστικός (kaustikós, “burning”), from καυστός (kaustós, “burnt”) + -ικός (-ikós).