1. Thickening of tissue in the motor tracts of the lateral columns and anterior horns of the spinal cord.
4. Nut of any of several trees of the genus Corylus.
7. On, to, or at the top.
11. Committee formed by a special-interest group to raise money for their favorite political candidates.
12. A flat wing-shaped process or winglike part of an organism.
13. Type genus of the Nepidae.
14. Any of various coarse shrubby plants of the genus Iva with small greenish flowers.
15. A cord that is drawn through eyelets or around hooks in order to draw together two edges (as of a shoe or garment).
16. A former agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States.
17. The capital and largest city of Yemen.
20. (computer science) A computer that is running software that allows users to leave messages and access information of general interest.
22. A gradual decline (in size or strength or power or number).
25. A drug combination found in some over-the-counter headache remedies (Aspirin and Phenacetin and Caffeine).
27. Type genus of the Alcidae comprising solely the razorbill.
31. (Babylonian) God of storms and wind.
33. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
35. A river in north central Switzerland that runs northeast into the Rhine.
36. An official prosecutor for a judicial district.
37. A compartment in front of a motor vehicle where driver sits.
38. A logarithmic unit of sound intensity.
40. A soft silvery metallic element of the alkali earth group.
42. A public promotion of some product or service.
45. The sense organ for hearing and equilibrium.
47. Any of a number of fishes of the family Carangidae.
51. The 7th letter of the Greek alphabet.
52. (Greek mythology) Daughter of Zeus and Demeter.
53. A master's degree in business.
54. An informal term for a father.
55. A song of praise (to God or to a saint or to a nation).
56. The network in the reticular formation that serves an alerting or arousal function.

1. Type genus of the Apidae.
2. Rock that in its molten form (as magma) issues from volcanos.
3. The act of scanning.
4. West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice.
5. Leaf or strip from a leaf of the talipot palm used in India for writing paper.
6. German organist and contrapuntist (1685-1750).
7. An associate degree in nursing.
8. A drop of the clear salty saline solution secreted by the lacrimal glands.
9. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
10. Large burrowing rodent of South and Central America.
18. The blood group whose red cells carry both the A and B antigens.
19. A loose sleeveless outer garment made from aba cloth.
21. A detailed description of design criteria for a piece of work.
23. A bachelor's degree in religion.
24. Having undesirable or negative qualities.
26. An accountant certified by the state.
28. Resinlike substance secreted by certain lac insects.
29. A white metallic element that burns with a brilliant light.
30. A colorless and odorless inert gas.
32. A light touch or stroke.
34. A port city in southwestern Iran.
39. A Chadic language spoken south of Lake Chad.
40. Airtight sealed metal container for food or drink or paint etc..
41. United States writer (born in Poland) who wrote in Yiddish (1880-1957).
42. A white soft metallic element that tarnishes readily.
43. A small cake leavened with yeast.
44. South African term for `boss'.
46. A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material.
48. Affectedly modest or shy especially in a playful or provocative way.
49. A human limb.
50. The rate at which heat is produced by an individual in a resting state.
51. An international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members.