1. The 7th letter of the Greek alphabet.
4. A graphical recording of the cardiac cycle produced by an electrocardiograph.
7. Small European freshwater fish with a slender bluish-green body.
11. A slight amount or degree of difference.
12. United States liquid unit equal to 4 quarts or 3.785 liters.
13. Of or relating to or characteristic of the Republic of Chad or its people or language.
14. The compass point that is one point east (clockwise) of due north.
15. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
17. The month following July and preceding September.
18. The branch of computer science that deal with writing computer programs that can solve problems creatively.
20. Gibberish resembling the sounds of a baby.
23. A flat wing-shaped process or winglike part of an organism.
24. English scholastic philosopher and assumed author of Occam's Razor (1285-1349).
26. A public promotion of some product or service.
29. A long thin fluffy scarf of feathers or fur.
34. Title for a civil or military leader (especially in Turkey).
40. (informal) Exceptionally good.
41. A radioactive element of the actinide series.
43. Large burrowing rodent of South and Central America.
44. The syllable naming the sixth (submediant) note of a major or minor scale in solmization.
47. Tag the base runner to get him out.
48. The compass point that is one point north of due east.
49. Related to or located at the back.
50. A loose sleeveless outer garment made from aba cloth.

1. An inactive volcano in Sicily.
2. A sock with a separation for the big toe.
3. A sweetened beverage of diluted fruit juice.
4. Attempting to get personal recognition for yourself (especially by unacceptable means).
5. A tight-fitting headdress.
6. Fleshy spore-bearing inner mass of e.g. a puffball or stinkhorn.
7. The district occupied entirely by the city of Washington.
8. According to the Old Testament he was a pagan king of Israel and husband of Jezebel (9th century BC).
9. part of the peritoneum attached to the stomach and to the colon and covering the intestines.
10. At or constituting a border or edge.
16. West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice.
19. The cry made by sheep.
21. Having undesirable or negative qualities.
22. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
25. A heavy odorless colorless gas formed during respiration and by the decomposition of organic substances.
27. An official prosecutor for a judicial district.
28. A small pellet fired from an air rifle or BB gun.
30. An esoteric or occult matter that is traditionally secret.
31. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
32. A geographical region of northeastern South America including Guyana and Surinam.
33. A flexible container with a single opening.
35. Taken or to be taken at random.
36. German chemist who was co-discoverer with Lise Meitner of nuclear fission (1879-1968).
37. A long-playing phonograph record.
38. Someone who works (or provides workers) during a strike.
39. A metabolic acid found in yeast and liver cells.
42. Being one hundred more than two hundred.
45. The blood group whose red cells carry both the A and B antigens.
46. A state in northwestern North America.