| ACROSS
1. A polymer of vinyl chloride used instead of rubber in electric cables.
4. Plant with an elongated head of broad stalked leaves resembling celery.
8. The residue that remains when something is burned.
11. Relating to or characteristic of or occurring in the air.
12. Group of people related by blood or marriage.
13. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
14. Someone who works (or provides workers) during a strike.
16. An agency of the United Nations affiliated with the World Bank.
17. Thigh of a hog (usually smoked).
18. A island in the Netherlands Antilles that is the top of an extinct volcano.
20. At a previous time.
22. A loose sleeveless outer garment made from aba cloth.
24. A Tibetan or Mongolian priest of Lamaism.
28. (computer science) A coding system that incorporates extra parity bits in order to detect errors.
30. A soft silvery metallic element of the alkali earth group.
32. The blood group whose red cells carry both the A and B antigens.
34. Extremely pleasing.
35. A medicinal drug used to evoke vomiting (especially in cases of drug overdose or poisoning).
39. Type genus of the Alcidae comprising solely the razorbill.
43. An enclosed space.
44. A sudden short attack.
47. A river in north central Switzerland that runs northeast into the Rhine.
48. Any of various coarse shrubby plants of the genus Iva with small greenish flowers.
49. Very dark black.
50. One of the most common of the five major classes of immunoglobulins.
51. A colloid that has a continuous liquid phase in which a solid is suspended in a liquid.
52. Largest known toad species.
53. A young woman making her debut into society.
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DOWN
1. Out of fashion.
2. A Roman Catholic priest who acts for another higher-ranking clergyman.
3. Infestation of the pubic hair by crab lice.
4. A state in southeastern United States.
5. American prizefighter who won the world heavyweight championship three times (born in 1942).
6. A genus of Ploceidae.
7. (Irish) Mother of the ancient Irish gods.
8. Title for a civil or military leader (especially in Turkey).
9. Any of a number of fishes of the family Carangidae.
10. Stable gear consisting of either of two curved supports that are attached to the collar of a draft horse and that hold the traces.
15. A Chadic language spoken south of Lake Chad.
19. West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice.
21. The cry made by sheep.
23. A small pellet fired from an air rifle or BB gun.
25. The branch of computer science that deal with writing computer programs that can solve problems creatively.
26. Informal terms for a mother.
27. A public promotion of some product or service.
29. Of or like a cecum.
31. A silvery soft waxy metallic element of the alkali metal group.
33. Date used in reckoning dates before the supposed year Christ was born.
36. A small constellation near the South Pole between Tucana and Ara.
37. A particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography).
38. 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.
39. A condition (mostly in boys) characterized by behavioral and learning disorders.
40. Set down according to a plan.
41. An enclosure made or wire or metal bars in which birds or animals are kept.
42. An Arabic speaking person who lives in Arabia or North Africa.
45. An informal debt instrument.
46. A nucleic acid consisting of large molecules shaped like a double helix.
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