| ACROSS
1. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
5. A metric unit of length equal to 100 meters.
7. One of the two main branches of orthodox Islam.
11. Amino acid that is formed in the liver and converted into dopamine in the brain.
12. The blood group whose red cells carry both the A and B antigens.
13. 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.
14. A translucent mineral consisting of hydrated silica of variable color.
15. Unknown god.
16. The 16th letter of the Hebrew alphabet.
17. A rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys.
18. (informal) Of the highest quality.
21. A complete metric system of units of measurement for scientists.
22. The cry made by sheep.
24. An informal term for a father.
31. Title for a civil or military leader (especially in Turkey).
32. A long thin fluffy scarf of feathers or fur.
33. According to the Old Testament he was a pagan king of Israel and husband of Jezebel (9th century BC).
34. A soft silvery metallic element of the alkali earth group.
36. A youthful male person.
38. Before noon.
40. A light strong brittle gray toxic bivalent metallic element.
41. Arboreal snake of central and southern Africa whose bite is often fatal.
45. A Chadic language spoken south of Lake Chad.
49. A river in north central Switzerland that runs northeast into the Rhine.
50. A flat wing-shaped process or winglike part of an organism.
52. A reptile genus of Iguanidae.
53. An informal term for a father.
54. A small cake leavened with yeast.
55. A workplace for the conduct of scientific research.
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DOWN
1. Any property detected by the olfactory system.
2. The head of the Roman Catholic Church.
3. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
4. West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice.
5. Australian shrubs and small trees with evergreen usually spiny leaves and dense clusters of showy flowers.
6. A master's degree in business.
7. Someone who works (or provides workers) during a strike.
8. Grass mowed and cured for use as fodder.
9. Wading birds of warm regions having long slender down-curved bills.
10. God of fire.
19. A white metallic element that burns with a brilliant light.
20. South American wood sorrel cultivated for its edible tubers.
23. The longer of the two telegraphic signals used in Morse code.
25. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
26. A light touch or stroke.
27. The bill in a restaurant.
28. Common Indian weaverbird.
29. An intensely radioactive metallic element that occurs in minute amounts in uranium ores.
30. A logarithmic unit of sound intensity.
35. A loose sleeveless outer garment made from aba cloth.
37. A member of the Siouan people formerly living in the Missouri river valley in NE Nebraska.
39. The arch of bone beneath the eye that forms the prominence of the cheek.
40. An informal term for a father.
42. A heavy long-handled hammer used to drive stakes or wedges.
43. A Chadic language spoken south of Lake Chad.
44. An Arabic speaking person who lives in Arabia or North Africa.
46. Having undesirable or negative qualities.
47. A state of southwestern India.
48. A compartment in front of a motor vehicle where driver sits.
51. A soft gray ductile metallic element used in alloys.
52. (Akkadian) God of wisdom.
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