Caustic compound Crossword Clue

We have the 4-letter answer for Caustic compound crossword clue, last seen in the WSJ Crossword December 9, 2025 puzzle. This answer will help you finish the puzzle you’re working on.

Caustic compound Crossword Answer

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LYE

(3 letters)

Helpful Hints

(noun)
1. street name for lysergic acid diethylamide
2. any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
(adjective)
1. being sour to the taste
2. harsh or corrosive in tone

Hint 2: Clue Definitions

COMPOUND (verb)
1. make more intense, stronger, or more marked
2. put or add together
COMPOUND (noun)
1. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
2. an enclosure of residences and other building (especially in the Orient)
COMPOUND (adjective)
1. composed of many distinct individuals united to form a whole or colony
2. composed of more than one part
CAUSTIC (adjective)
1. of a substance, especially a strong acid; capable of destroying or eating away by chemical action
2. harsh or corrosive in tone
CAUSTIC (noun)
1. any chemical substance that burns or destroys living tissue

Hint 3: Other Answers Used in the Past

LYE
(3 letters)

Hint 4: Anagram

Unscramble the letters below to solve for today's answer.
CADI

More WSJ Crossword (12/9/2025) Answers

Across

1. Nasty buildup

5. Dagger grips

10. Fly catchers

14. Declare false

15. ___ a time (individually)

16. World War I spy Mata ___

17. Regular customers

19. Very much

20. Singer Lavigne

21. Plastic used over a broken window, e.g.

23. Deli loaf

24. Credit card option

26. Misspeak, say

27. Ref. book

28. OpenAI CEO Altman

29. "___ in apple"

30. ___ oil (varnish ingredient)

33. Inflicted upon

37. Company that pioneered color TV

38. *Part of a model train set

40. Gun as an engine

41. Type of toast

43. Time toggle

44. Brian of Roxy Music

45. Poetic sphere

47. Chinese zodiac animal

49. Righteous Babe Records founder DiFranco

50. *V constituent

55. Dr.’s study

56. Simple wind instruments

57. Flip call

59. Not barefoot

60. “To be on the safe side,” like each starred answer

63. Bulky book

64. Pungent bulb

65. Tabloid twosome

66. Evening, in Arles

67. Shrek creator William

68. Insect repellent compound

All Answers

Down

1. Outbreak-monitoring health agcy.

2. It may have four legs

3. Studio with a globe logo

4. Fabric worker

5. Southern capital city nickname

6. Like Haydn’s Symphony No. 46

7. Chow line?

8. Lt. Yar of “Star Trek: The Next Generation”

9. War horses

10. Classic riddle question

11. Like some kitchens

12. Rodeo horse

13. Hold to the fire

18. Pleasant

22. Sidestep, say

23. Prepare for more fighting

25. Gear for a diver

31. __ de plume

32. Enter the NFL draft, e.g.

34. Romantic ideal

35. Middle orange avenue in Monopoly

36. Egg-shaped

38. Rap's ___ B

39. Great, in Great Britain

42. Live-in student

46. Bluegrass strings

48. Typical high schooler

50. Operating outlay

51. “Gesundheit” preceder

52. Grammy winner Judd

53. Hollow-cheeked

54. Davis of Do the Right Thing

61. "You," in Paris

62. CPR expert

All Answers