| ACROSS
1. (prefix) Opposite or opposing or neutralizing.
4. Harsh or corrosive in tone.
8. The bill in a restaurant.
11. The 19th letter of the Greek alphabet.
12. Fallow deer.
13. To make a mistake or be incorrect.
14. The capital and largest city of Norway.
16. A workplace for the conduct of scientific research.
17. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
18. The bags of letters and packages that are transported by the postal service.
19. After noon.
21. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
22. Large burrowing rodent of South and Central America.
24. An informal term for a father.
26. Title for a civil or military leader (especially in Turkey).
28. A radioactive element of the actinide series.
29. The elementary stages of any subject (usually plural).
32. A state in midwestern United States.
37. (Irish) Mother of the ancient Irish gods.
38. A member of an agricultural people of southern India.
45. A flat wing-shaped process or winglike part of an organism.
46. The cry made by sheep.
50. An inflammatory disease involving the sebaceous glands of the skin.
52. An intensely radioactive metallic element that occurs in minute amounts in uranium ores.
53. A metabolic acid found in yeast and liver cells.
54. A body of (usually fresh) water surrounded by land.
55. A trivalent metallic element of the rare earth group.
56. Showing characteristics of age, especially having gray or white hair.
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DOWN
1. (physics and chemistry) The smallest component of an element having the chemical properties of the element.
2. An independent agency of the United States government responsible for aviation and spaceflight.
3. Eurasian perennial bulbous herbs.
4. A public promotion of some product or service.
5. A high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus.
6. (Islam) The man who leads prayers in a mosque.
7. A light touch or stroke.
8. Two-year-old sheep.
9. Type genus of the family Arcidae.
10. (informal) Exceptionally good.
15. Leaf or strip from a leaf of the talipot palm used in India for writing paper.
20. A white metallic element that burns with a brilliant light.
23. A compartment in front of a motor vehicle where driver sits.
25. 10 grams.
27. A rare silvery (usually trivalent) metallic element.
30. A soft silvery metallic element of the alkali earth group.
31. A hard brittle blue-white multivalent metallic element.
33. A loose sleeveless outer garment made from aba cloth.
34. (astronomy) The angular distance of a celestial point measured westward along the celestial equator from the zenith crossing.
35. Used of a single unit or thing.
36. A silvery soft waxy metallic element of the alkali metal group.
39. Type genus of the Alcidae comprising solely the razorbill.
40. Unpleasantly cool and humid.
41. A unit of magnetomotive force equal to 0.7958 ampere-turns.
42. A river in north central Switzerland that runs northeast into the Rhine.
43. A small cake leavened with yeast.
44. Massive plantigrade carnivorous or omnivorous mammals with long shaggy coats and strong claws.
47. A river in north central Switzerland that runs northeast into the Rhine.
48. Enlarged prostate.
49. Of or relating to a member of the Buddhist people inhabiting the Mekong river in Laos and Thailand.
50. A white metallic element that burns with a brilliant light.
51. The branch of engineering science that studies the uses of electricity and the equipment for power generation and distribution and the control of machines and communication.
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