Across

1. Diamond or ruby

4. Seventh letter of the Greek alphabet

7. The U of “Law & Order: SVU”

11. Batter's stat

12. Stage constructions

14. Notorious Roman emperor

15. Schubert's “The ___ King”

16. Engine housing

18. Faust dramatist

20. Slippery swimmer

21. Dates

22. Win over

26. Canada's capital

28. Rat or squirrel

29. Kung ___ shrimp

30. Suit topper

31. Christmas tree decoration

35. Noble's partner

38. Jacket part

39. Oklahoma city near Vance Air Force Base

40. Architect Mies van ___ Rohe

41. Optimally

44. Sworn to tell the truth

48. McClanahan of “The Golden Girls”

49. Derriere

50. Spot in the ocean

51. Mess up

52. Signals agreement

53. Garment bottom

54. ___ of iniquity

Down

1. Diver Louganis

2. Longest Spanish river

3. Significant event

4. Abstain from

5. Humanitarian Mother ___

6. Words before loss or standstill

7. In one's birthday suit

8. Culture-supporting org.

9. Treasury org.

10. Low digit?

13. Express contempt

17. Number-picker's game

19. Afternoon drink

23. Rambled

24. “___ Upon a Mattress”

25. Numbered hwys.

26. Makes a choice

27. Kite part

32. Passover meals

33. ___ and anon

34. The king of France

35. John, Paul, George, or Ringo

36. “O Canada,” e.g.

37. Make fun of

42. Without a doubt

43. Gull-like bird

44. “Ode on a Grecian ___”

45. Prefix with romantic

46. Family guy

47. Louisville Slugger wood

Solution on page 329