1. A condition (mostly in boys) characterized by behavioral and learning disorders.
4. A tight-fitting headdress.
7. Slanting diagonally across the grain of a fabric.
11. American prizefighter who won the world heavyweight championship three times (born in 1942).
12. Used of a single unit or thing.
13. A river in north central Switzerland that runs northeast into the Rhine.
14. A river in north central Switzerland that runs northeast into the Rhine.
15. The cry made by sheep.
16. (informal) Very tired.
17. Having been read.
20. The sound made by corvine birds.
23. A bachelor's degree in religion.
25. The basic unit of money in Thailand.
29. Title for a civil or military leader (especially in Turkey).
31. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
32. An associate degree in applied science.
33. The Tibeto-Burman language spoken in the Dali region of Yunnan.
36. An associate degree in nursing.
43. A small cake leavened with yeast.
46. A flat wing-shaped process or winglike part of an organism.
47. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
49. A digital display that uses liquid crystal cells that change reflectivity in an applied electric field.
50. An informal term for a father.
51. Consisting of or involving two parts or components usually in pairs.
52. A plant hormone promoting elongation of stems and roots.

1. A flat-bottomed volcanic crater that was formed by an explosion.
2. (Scottish) Bluish-black or gray-blue.
3. English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984).
4. A compartment in front of a motor vehicle where driver sits.
5. (Irish) Mother of the ancient Irish gods.
6. Seed of a pea plant.
7. A coffee cake flavored with orange rind and raisins and almonds.
8. The United Nations agency concerned with atomic energy.
9. An Arabic speaking person who lives in Arabia or North Africa.
10. Stalk of a moss capsule.
18. A light touch or stroke.
19. A colorless and odorless inert gas.
21. Gully or streambed in North Africa and the Middle East that remains dry except during rainy season.
22. The 7th letter of the Greek alphabet.
24. 1/10 gram.
26. A rare silvery (usually trivalent) metallic element.
27. A white metallic element that burns with a brilliant light.
28. A very poisonous metallic element that has three allotropic forms.
30. The blood group whose red cells carry both the A and B antigens.
34. A loose sleeveless outer garment made from aba cloth.
35. (Akkadian) God of wisdom.
37. Plant with an elongated head of broad stalked leaves resembling celery.
38. Title for a civil or military leader (especially in Turkey).
39. Any of numerous local fertility and nature deities worshipped by ancient Semitic peoples.
40. Surrealist Spanish painter (1904-1989).
41. Type genus of the Alcidae comprising solely the razorbill.
42. A quantity of no importance.
44. Having undesirable or negative qualities.
45. An informal debt instrument.
48. A doctor's degree in religion.