| ACROSS
1. A river in north central Switzerland that runs northeast into the Rhine.
4. A constellation in the southern hemisphere near Telescopium and Norma.
7. Harsh or corrosive in tone.
11. A federal agency established to regulate the release of new foods and health-related products.
12. Light informal conversation for social occasions.
13. Informal terms for a mother.
14. Consisting of or made of wood of the oak tree.
15. A flat wing-shaped process or winglike part of an organism.
16. An Arabic speaking person who lives in Arabia or North Africa.
17. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
20. A hard gray lustrous metallic element that is highly corrosion-resistant.
21. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
25. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
28. European sedge having small edible nutlike tubers.
29. Informal terms for a mother.
31. Date used in reckoning dates before the supposed year Christ was born.
32. Port city in northwestern Belgium and industrial center.
33. The blood group whose red cells carry both the A and B antigens.
34. A small pellet fired from an air rifle or BB gun.
37. 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.
41. The sense organ for hearing and equilibrium.
46. The cry made by sheep.
47. The 7th letter of the Greek alphabet.
48. A small cake leavened with yeast.
49. A cgs unit of work or energy.
50. An interest followed with exaggerated zeal.
51. An utterance expressing pain or disapproval.
52. A nucleic acid consisting of large molecules shaped like a double helix.
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DOWN
1. Traveling by foot.
2. (Babylonian) A demigod or first man.
3. A dissolute man in fashionable society.
4. Title for a civil or military leader (especially in Turkey).
5. English courtier (a favorite of Elizabeth I) who tried to colonize Virginia.
6. A loose sleeveless outer garment made from aba cloth.
7. A woman hired to suckle a child of someone else.
8. A bottle with a stopper.
9. (Islam) The man who leads prayers in a mosque.
10. A Chadic language spoken south of Lake Chad.
18. An informal conversation.
19. (Hinduism and Buddhism) The effects of a person's actions that determine his destiny in his next incarnation.
22. A heavy odorless colorless gas formed during respiration and by the decomposition of organic substances.
23. The month following July and preceding September.
24. Airtight sealed metal container for food or drink or paint etc..
26. A soft heavy toxic malleable metallic element.
27. A radioactive element of the actinide series.
30. The elementary stages of any subject (usually plural).
35. A Chadic language spoken south of Lake Chad.
36. An amino acid that is found in the central nervous system.
38. In bed.
39. An outlying farm building for storing grain or animal feed and housing farm animals.
40. Mentally or physically infirm with age.
42. A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material.
43. A defensive missile designed to shoot down incoming intercontinental ballistic missiles.
44. 10 hao equal 1 dong.
45. A decree that prohibits something.
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