1. Rate of revolution of a motor.
4. The probability of a specified outcome.
8. A rapid bustling commotion.
11. A plant hormone promoting elongation of stems and roots.
12. Common Indian weaverbird.
13. The upper side of the thighs of a seated person.
14. Someone who works (or provides workers) during a strike.
16. A pilgrimage to Mecca.
17. The compass point that is one point east of due south.
18. A unit of weight for precious stones = 200 mg.
20. An informal term for a father.
22. A radioactive element of the actinide series.
23. A slight amount or degree of difference.
24. (British) A waterproof raincoat made of rubberized fabric.
26. A small cake leavened with yeast.
32. An undergarment worn by women to support their breasts.
34. Freedom from difficulty or hardship or effort.
35. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
36. A soft silvery metallic element of the alkali earth group.
37. The blood group whose red cells carry both the A and B antigens.
39. A compartment in front of a motor vehicle where driver sits.
42. An ugly evil-looking old woman.
45. (informal) Exceptionally good.
47. Lacking or deprive of the sense of hearing wholly or in part.
49. An official prosecutor for a judicial district.
50. The sense organ for hearing and equilibrium.
53. An insecticide that is also toxic to animals and humans.
54. (Old Testament) In Judeo-Christian mythology.
55. A federal agency established to regulate the release of new foods and health-related products.

1. (computer science) A kind of computer architecture that has a relatively small set of computer instructions that it can perform.
2. Large burrowing rodent of South and Central America.
3. A flat-bottomed volcanic crater that was formed by an explosion.
4. A Russian river.
5. The longer of the two telegraphic signals used in Morse code.
6. Two items of the same kind.
7. A mountain peak in the Andes in Bolivia (21,391 feet high).
8. Thickening of tissue in the motor tracts of the lateral columns and anterior horns of the spinal cord.
9. A Chadic language spoken south of Lake Chad.
10. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
15. A Chadic language spoken south of Lake Chad.
19. A hard gray lustrous metallic element that is highly corrosion-resistant.
21. Indigo bush.
25. An accountant certified by the state.
27. A colorless and odorless inert gas.
28. A flexible container with a single opening.
29. A white metallic element that burns with a brilliant light.
30. A very poisonous metallic element that has three allotropic forms.
31. A ductile gray metallic element of the lanthanide series.
33. Resinlike substance secreted by certain lac insects.
38. A small nail.
39. A river in north central Switzerland that runs northeast into the Rhine.
40. (Babylonian) God of storms and wind.
41. Area around the altar of a church for the clergy and choir.
43. A condition (mostly in boys) characterized by behavioral and learning disorders.
44. (Greek mythology) Goddess of the earth and mother of Cronus and the Titans in ancient mythology.
46. The products of human creativity.
48. A defensive missile designed to shoot down incoming intercontinental ballistic missiles.
51. A state in midwestern United States.
52. A radioactive transuranic element.