| ACROSS
1. Any of various trees of the genus Ulmus.
4. An independent agency of the United States government responsible for aviation and spaceflight.
8. A doctor's degree in dental medicine.
11. A doctor's degree in education.
12. A member of an extinct North American Indian people who lived in the Pit river valley in northern California.
13. A plant hormone promoting elongation of stems and roots.
14. A barrier constructed to contain the flow or water or to keep out the sea.
15. A verbalization that encourages you to attempt something.
16. A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material.
17. Jordan's port.
21. A radioactive element of the actinide series.
22. The last (12th) month of the year.
28. African tree having an exceedingly thick trunk and fruit that resembles a gourd and has an edible pulp called monkey bread.
32. The act of slowing down or falling behind.
33. Containing or made of or resembling or characteristic of a metal.
36. The sacred city of Lamaism.
40. Someone who works (or provides workers) during a strike.
43. A silvery ductile metallic element found primarily in bauxite.
44. The 7th letter of the Greek alphabet.
46. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
48. A pass between mountain peaks.
49. Having undesirable or negative qualities.
50. The basic unit of money in Bangladesh.
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DOWN
1. Tropical starchy tuberous root.
2. An accidental hole that allows something (fluid or light etc.) to enter or escape.
3. Designer drug designed to have the effects of amphetamines (it floods the brain with serotonin) but to avoid the drug laws.
4. Monotypic genus of palms of Australasia.
5. A river in north central Switzerland that runs northeast into the Rhine.
6. An ancient musical horn made from the horn of a ram.
7. A resource.
8. English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984).
9. A flat-bottomed volcanic crater that was formed by an explosion.
10. An informal term for a father.
18. A light strong brittle gray toxic bivalent metallic element.
19. (informal) Roused to anger.
20. Open-heart surgery in which the rib cage is opened and a section of a blood vessel is grafted from the aorta to the coronary artery to bypass the blocked section of the coronary artery and improve the blood supply to the heart.
23. (Akkadian) God of wisdom.
24. A heavy odorless colorless gas formed during respiration and by the decomposition of organic substances.
25. Any of numerous local fertility and nature deities worshipped by ancient Semitic peoples.
26. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
27. A soft silvery metallic element of the alkali earth group.
29. Divulge information or secrets.
30. Being ten more than one hundred eighty.
31. A loose sleeveless outer garment made from aba cloth.
34. (prefix) Outside or outer.
35. An official language of the Republic of South Africa.
37. A loud raucous cry as of an awl.
38. A branch of the Tai languages.
39. Type genus of the Alcidae comprising solely the razorbill.
41. A flat wing-shaped process or winglike part of an organism.
42. An informal term for a father.
45. A Russian river.
47. An informal term for a father.
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