| ACROSS
1. Title for a civil or military leader (especially in Turkey).
4. Produced by a manufacturing process.
8. A workplace for the conduct of scientific research.
11. The longer of the two telegraphic signals used in Morse code.
12. Any broad thin and limber covering attached at one edge.
13. An extension at the end and at right angles to the main building.
14. One of the most common of the five major classes of immunoglobulins.
15. Title for a civil or military leader (especially in Turkey).
16. South American wood sorrel cultivated for its edible tubers.
17. A sock with a separation for the big toe.
19. A silvery ductile metallic element found primarily in bauxite.
21. The blood group whose red cells carry both the A and B antigens.
22. (informal) Of the highest quality.
26. The capital and largest city of Yemen.
29. A unit of dry measure used in Egypt.
30. Top part of an apron.
34. King of Saudi Arabia since 1982 (born in 1922).
38. A Pacific island north of Australia.
41. A colorless and odorless inert gas.
44. A flat wing-shaped process or winglike part of an organism.
45. A compartment in front of a motor vehicle where driver sits.
48. The month following October and preceding December.
49. The elementary stages of any subject (usually plural).
50. A Chadic language spoken south of Lake Chad.
51. (Irish) Mother of the ancient Irish gods.
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DOWN
1. A nearly horizontal passage from the surface into a mine.
2. Mentally or physically infirm with age.
3. According to the Old Testament he was a pagan king of Israel and husband of Jezebel (9th century BC).
4. A master's degree in fine arts.
5. Primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves.
6. Tropical woody herb with showy yellow flowers and flat pods.
7. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
8. A zodiacal constellation in northern hemisphere between Cancer and Virgo.
9. Type genus of the Alcidae comprising solely the razorbill.
10. Divulge information or secrets.
18. A plant hormone promoting elongation of stems and roots.
20. A bottle with a stopper.
23. A white metallic element that burns with a brilliant light.
24. Having undesirable or negative qualities.
25. A public promotion of some product or service.
27. The branch of computer science that deal with writing computer programs that can solve problems creatively.
28. A soft gray ductile metallic element used in alloys.
31. (Akkadian) God of wisdom.
32. The month following July and preceding September.
33. A soft silvery metallic element of the alkali earth group.
35. (Hindu) A manner of sitting (as in the practice of Yoga).
36. A compound in which the hydrogen atoms of a hydrocarbon have been replaced by bromine and other halogen atoms.
37. An Indian tree of the family Combretaceae that is a source of timber and gum.
39. An Arabic speaking person who lives in Arabia or North Africa.
40. A metabolic acid found in yeast and liver cells.
42. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
43. An awkward stupid person.
46. Date used in reckoning dates before the supposed year Christ was born.
47. A gray lustrous metallic element of the rare earth group.
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