1. A fatal disease of cattle that affects the central nervous system.
4. In bed.
8. A female person who has the same parents as another person.
11. A drug combination found in some over-the-counter headache remedies (Aspirin and Phenacetin and Caffeine).
12. The capital and largest city of Yemen.
13. Of or relating to or characteristic of Thailand of its people.
14. A police officer who investigates crimes.
15. United States physiologist (born in Germany) who did research on parthenogenesis (1859-1924).
16. Title for a civil or military leader (especially in Turkey).
17. A radioactive element of the actinide series.
19. American professional baseball player who hit more home runs than Babe Ruth (born in 1934).
24. A defensive missile designed to shoot down incoming intercontinental ballistic missiles.
26. A loose sleeveless outer garment made from aba cloth.
27. The (prehensile) extremity of the superior limb.
29. Cubes of meat marinated and cooked on a skewer usually with vegetables.
31. Someone who works (or provides workers) during a strike.
33. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
34. A river in north central Switzerland that runs northeast into the Rhine.
37. A flat-bottomed volcanic crater that was formed by an explosion.
41. (folklore) A corpse that rises at night to drink the blood of the living.
43. A French abbot.
44. Automatic data processing by electronic means without the use of tabulating cards or punched tapes.
46. A white linen liturgical vestment with sleeves.
47. Goddess of the dead and queen of the underworld.
49. Extremely pleasing.
50. Fermented alcoholic beverage similar to but heavier than beer.
51. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
52. Black tropical American cuckoo.

1. A Chadic language spoken south of Lake Chad.
2. A detailed description of design criteria for a piece of work.
3. (computer science) A coding system that incorporates extra parity bits in order to detect errors.
4. The sign language used in the United States.
5. African tree having an exceedingly thick trunk and fruit that resembles a gourd and has an edible pulp called monkey bread.
6. The compass point midway between northeast and east.
7. A Chadic language spoken south of Lake Chad.
8. Indicating the most important performer or role.
9. The villain in William Shakespeare's tragedy who tricked Othello into murdering his wife.
10. A city of central China.
18. Being ten more than one hundred ninety.
20. A member of the Semitic speaking people of northern Ethiopia.
21. The executive agency that advises the President on the federal budget.
22. Open-heart surgery in which the rib cage is opened and a section of a blood vessel is grafted from the aorta to the coronary artery to bypass the blocked section of the coronary artery and improve the blood supply to the heart.
23. An independent group of closely related Chadic languages spoken in the area between the Biu-Mandara and East Chadic languages.
25. A light strong brittle gray toxic bivalent metallic element.
28. The blood group whose red cells carry both the A and B antigens.
30. A river in north central Switzerland that runs northeast into the Rhine.
32. A high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus.
35. The capital of Lombardy in northern Italy.
36. Spiritual leader of a Jewish congregation.
38. Norwegian mathematician (1802-1829).
39. (usually followed by `to') Having the necessary means or skill or know-how or authority to do something.
40. A collection of objects laid on top of each other.
41. A colorless odorless gaseous element that give a red glow in a vacuum tube.
42. A Chadic language spoken south of Lake Chad.
43. Gone by.
45. Small cubes with 1 to 6 spots on the faces.
46. A soft silvery metallic element of the alkali earth group.
48. Functioning correctly and ready for action.