| ACROSS
1. An amino acid that is found in the central nervous system.
5. A belief (or system of beliefs) accepted as authoritative by some group or school.
8. A workplace for the conduct of scientific research.
11. An accidental hole that allows something (fluid or light etc.) to enter or escape.
12. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
13. To make a mistake or be incorrect.
14. A tiny or scarcely detectable amount.
15. A negative.
16. South American wood sorrel cultivated for its edible tubers.
17. An associate degree in nursing.
18. African tree having an exceedingly thick trunk and fruit that resembles a gourd and has an edible pulp called monkey bread.
20. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
21. Relating to or characteristic of or occurring in the air.
23. Title for a civil or military leader (especially in Turkey).
26. A period marked by distinctive character or reckoned from a fixed point or event.
29. A compartment in front of a motor vehicle where driver sits.
32. The inner and thicker of the two bones of the human leg between the knee and ankle.
35. Type genus of the Alaudidae.
37. A river in north central Switzerland that runs northeast into the Rhine.
38. A condition (mostly in boys) characterized by behavioral and learning disorders.
39. A radioactive element of the actinide series.
45. A small cake leavened with yeast.
47. A flexible container with a single opening.
50. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
52. The 7th letter of the Greek alphabet.
53. A doctor's degree in education.
54. An Arabic speaking person who lives in Arabia or North Africa.
55. A metric unit of volume or capacity equal to 10 liters.
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DOWN
1. Sustentacular tissue that surrounds and supports neurons in the central nervous system.
2. (in Gnosticism) A divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe.
3. Nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate.
4. Jordan's port.
5. Refuse to acknowledge.
6. Someone who works (or provides workers) during a strike.
7. A member of an American Indian people of Yucatan and Belize and Guatemala who once had a culture characterized by outstanding architecture and pottery and astronomy.
8. A zodiacal constellation in northern hemisphere between Cancer and Virgo.
9. Type genus of the family Arcidae.
10. (informal) Exceptionally good.
19. The branch of computer science that deal with writing computer programs that can solve problems creatively.
22. The act of moving along swiftly (as before a gale).
24. Of or relating to the stomach and intestines.
25. A loose sleeveless outer garment made from aba cloth.
27. An intensely radioactive metallic element that occurs in minute amounts in uranium ores.
28. A flat wing-shaped process or winglike part of an organism.
30. A public promotion of some product or service.
31. A soft silvery metallic element of the alkali earth group.
33. The United Nations agency concerned with atomic energy.
34. A colorless and odorless inert gas.
36. Hormone secreted by the posterior pituitary gland (trade name Pitressin) and also by nerve endings in the hypothalamus.
40. A strip of land projecting into a body of water.
41. Little known Kamarupan languages.
42. Common Indian weaverbird.
43. A Chadic language spoken south of Lake Chad.
44. Any of numerous local fertility and nature deities worshipped by ancient Semitic peoples.
46. Having undesirable or negative qualities.
47. A loose sleeveless outer garment made from aba cloth.
48. Light informal conversation for social occasions.
49. A piece of furniture that provides a place to sleep.
50. A white metallic element that burns with a brilliant light.
51. A rare silvery (usually trivalent) metallic element.
52. A metal-bearing mineral valuable enough to be mined.
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