| ACROSS
1. Thickening of tissue in the motor tracts of the lateral columns and anterior horns of the spinal cord.
4. An ancient Egyptian city on the west bank of the Nile opposite Cairo.
8. A doctor's degree in dental surgery.
11. Resinlike substance secreted by certain lac insects.
12. Using speech rather than writing.
13. (British) A waterproof raincoat made of rubberized fabric.
14. A vinyl polymer used especially in paints or adhesives.
15. Mentally or physically infirm with age.
16. A nucleic acid consisting of large molecules shaped like a double helix.
17. A region of Malaysia in northeastern Borneo.
20. A public promotion of some product or service.
22. An intensely radioactive metallic element that occurs in minute amounts in uranium ores.
24. A loose sleeveless outer garment made from aba cloth.
28. Harsh or corrosive in tone.
31. A midnight meeting of witches to practice witchcraft and sorcery.
34. A white metallic element that burns with a brilliant light.
35. A member of the Siouan people formerly living in the Missouri river valley in NE Nebraska.
37. A metallic element of the rare earth group.
43. An ugly evil-looking old woman.
47. A slender double-reed instrument.
48. The elementary stages of any subject (usually plural).
49. Liquid containing proteins and electrolytes including the liquid in blood plasma and interstitial fluid.
50. A Loloish language.
51. A plant hormone promoting elongation of stems and roots.
52. The cry made by sheep.
53. A flat-bottomed volcanic crater that was formed by an explosion.
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DOWN
1. A large mountain system in south-central Europe.
2. Rock that in its molten form (as magma) issues from volcanos.
3. Someone who works (or provides workers) during a strike.
4. Dutch postimpressionist painter noted for his use of color (1853-1890).
5. A self-funded retirement plan that allows you to contribute a limited yearly sum toward your retirement.
6. The capital of Croatia.
7. A flat wing-shaped process or winglike part of an organism.
8. A doctor's degree in dental medicine.
9. (Irish) Mother of the Tuatha De Danann.
10. Any of a number of fishes of the family Carangidae.
18. The branch of computer science that deal with writing computer programs that can solve problems creatively.
19. Decapod having eyes on short stalks and a broad flattened carapace with a small abdomen folded under the thorax and pincers.
21. A Chadic language spoken south of Lake Chad.
23. A radioactive element of the actinide series.
25. A soft silvery metallic element of the alkali earth group.
26. A defensive missile designed to shoot down incoming intercontinental ballistic missiles.
27. The longer of the two telegraphic signals used in Morse code.
29. Being nine more than ninety.
30. An official prosecutor for a judicial district.
32. Having undesirable or negative qualities.
33. Title for a civil or military leader (especially in Turkey).
36. A coffee cake flavored with orange rind and raisins and almonds.
38. A small cake leavened with yeast.
39. A Chadic language spoken south of Lake Chad.
40. A rich soil consisting of a mixture of sand and clay and decaying organic materials.
41. The capital and chief port of Qatar.
42. A period of time containing 365 (or 366) days.
44. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
45. God of the earth.
46. South American wood sorrel cultivated for its edible tubers.
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