| ACROSS
1. An operating system that is on a disk.
4. Electronic warfare undertaken under direct control of an operational commander to locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition.
7. A Chadic language spoken south of Lake Chad.
11. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
12. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
13. Mild yellow Dutch cheese made in balls.
14. A logarithmic unit of sound intensity equal to 10 decibels.
15. Offering fun and gaiety.
17. A defensive missile designed to shoot down incoming intercontinental ballistic missiles.
18. A fraudulent business scheme.
20. East Indian tree bearing a profusion of intense vermilion velvet-textured blooms and yielding a yellow dye.
21. An enzyme that catalyzes the oxidation of many body compounds (e.g., epinephrine and norepinephrine and serotonin).
22. A river in north central Switzerland that runs northeast into the Rhine.
23. A humorous anecdote or remark.
24. A software system that facilitates the creation and maintenance and use of an electronic database.
26. Angular distance above the horizon (especially of a celestial object).
27. A loose sleeveless outer garment made from aba cloth.
29. A radioactive element of the actinide series.
30. The elementary stages of any subject (usually plural).
33. Title for a civil or military leader (especially in Turkey).
35. An association of countries in the western hemisphere.
38. A demon who swallows the sun causing eclipses.
40. (informal) Of the highest quality.
42. An official prosecutor for a judicial district.
43. Type genus of the Anatidae.
44. A woman's dress style that imitates the caftan cloaks worn by men in the Near East.
46. A unit of electrical power in an AC circuit equal to the power dissipated when 1 volt produces a current of 1 ampere.
49. (Irish) Mother of the ancient Irish gods.
50. A flat wing-shaped process or winglike part of an organism.
51. Pompous or pretentious talk or writing.
52. The cry made by sheep.
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DOWN
1. United States labor organizer who ran for President as a socialist (1855-1926).
2. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
3. A deep bow.
4. Animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes.
5. Any of a number of fishes of the family Carangidae.
6. A port city and resort in Andalusia in southern Spain on the Mediterranean.
7. A Mid-Atlantic state.
8. (Old Testament) In Judeo-Christian mythology.
9. A small cake leavened with yeast.
10. Projectiles to be fired from a gun.
16. Jordan's port.
19. An independent group of closely related Chadic languages spoken in the area between the Biu-Mandara and East Chadic languages.
25. Mentally or physically infirm with age.
28. A soft silvery metallic element of the alkali earth group.
31. Obvious and dull.
32. Green algae common in freshwater lakes of limestone districts.
34. The capital and largest city of Ghana with a deep-water port.
36. A city in southern Turkey on the Seyhan River.
37. The capital and largest city of Yemen.
39. North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean.
41. (used of count nouns) Every one considered individually.
45. The bill in a restaurant.
46. A soft silvery metallic element of the alkali earth group.
47. A unit of information equal to one million (1,048,576) bytes.
48. A silvery ductile metallic element found primarily in bauxite.
49. Title for a civil or military leader (especially in Turkey).
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