| ACROSS
1. The portion of the vertebrate nervous system consisting of the brain and spinal cord.
4. Hard plate or element of the exoskeleton of some arthropods.
12. A defensive missile designed to shoot down incoming intercontinental ballistic missiles.
15. Headdress that protects the head from bad weather.
16. Associated with the eardrum.
17. A federation of North American industrial unions that merged with the American Federation of Labor in 1955.
18. A medicinal drug used to evoke vomiting (especially in cases of drug overdose or poisoning).
20. A person who puts finishing edges on a garment.
21. (British) A linear measure of 16.5 feet.
22. A medieval hood of mail suspended from a basinet to protect the head and neck.
23. Having or showing profound knowledge.
25. A member of an Iroquoian people formerly living on the south shore of Lake Erie in northern Ohio and northwest Pennsylvania and western New York.
28. Mild yellow Dutch cheese made in balls.
29. Type genus of the Anatidae.
32. A New England state.
33. Father of the storm gods Marut.
34. Cubes of meat marinated and cooked on a skewer usually with vegetables.
35. (sport) Used of your own ground.
37. An aromatic gum resin obtained from various Arabian or East African trees.
41. United States naturalist (born in England) who advocated the creation of national parks (1838-1914).
42. Monotypic genus of palms of Australasia.
44. A metal-bearing mineral valuable enough to be mined.
46. Any of numerous trees of the family Cupressaceae that resemble cedars.
48. Being one more than thirteen.
49. (Light Amplification by Stimulated Emission of Radiation) Optical device that produces an intense monochromatic beam of coherent light.
51. A burn cause by hot liquid or steam.
53. A silvery ductile metallic element found primarily in bauxite.
54. (British) A waterproof raincoat made of rubberized fabric.
56. A brittle gray crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors.
57. Chief port of Yemen.
62. A deciduous tree of the family Ulmaceae that grows in the southeastern United States.
64. A very light colorless element that is one of the six inert gasses.
65. Having help.
69. Scottish chemist noted for his research into the structure of nucleic acids (born in 1907).
70. (Babylonian) A goddess of the watery deep and daughter of Ea.
72. Any of various hard resins from trees of the family Dipterocarpaceae and of the genus Agathis.
73. Experiencing or showing sorrow or unhappiness.
77. 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.
78. A nucleic acid consisting of large molecules shaped like a double helix.
79. Liveliness and eagerness.
80. What you can repeat immediately after perceiving it.
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DOWN
1. Elegant and stylish.
2. Plant with an elongated head of broad stalked leaves resembling celery.
3. (linguistics) The form of a word after all affixes are removed.
4. Support consisting of a place to rest the foot while ascending or descending a stairway.
5. (thermodynamics) Conforming to the Carnot cycle.
6. A unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions.
7. A fencing sword similar to a foil but with a heavier blade.
8. A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material.
9. An actress who specializes in playing the role of an artless innocent young girl.
10. Having or arranged in tiers.
11. A very light brown.
12. Strong and sharp.
13. All the plant and animal life of a particular region.
14. (from a combination of MOdulate and DEModulate) Electronic equipment consisting of a device used to connect computers by a telephone line.
19. Conqueror of Gaul and master of Italy (100-44 BC).
24. The event of dying or departure from life.
26. Motivation based on ideas of right and wrong.
27. A large fleet.
30. Of or relating to the nervous system.
31. True firs.
36. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
38. The cardinal number that is the sum of five and one.
39. Liquid excretory product.
40. Being one more than six.
43. A unit of dry measure used in Egypt.
45. Any of several short-billed Old World rails.
47. Primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves.
50. Make improvements or corrections to.
52. Genus of western United States annuals with showy yellow or white flowers.
55. Of the appetites and passions of the body.
58. A genus of Ploceidae.
59. The basic unit of money in Nigeria.
60. A seat for one person, with a support for the back.
61. To a severe or serious degree.
63. The provision of money temporarily (usually at interest).
66. A doctor's degree in music.
67. Situated in or facing or moving toward the east.
68. A unit of apothecary weight equal to an eighth of an ounce or to 60 grains.
71. Government agency created in 1974 to license and regulate nuclear power plants.
74. A state in northwestern United States on the Pacific.
75. Of or relating to the stomach and intestines.
76. A highly unstable radioactive element (the heaviest of the halogen series).
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