| ACROSS
1. Consisting of or made of wood of the oak tree.
4. Tag the base runner to get him out.
7. United States tennis player who was the first Black to win United States and English singles championships (1943-1993).
11. One of the strands twisted together to make yarn or rope or thread.
12. An agency of the United Nations affiliated with the World Bank.
13. Having or demonstrating ability to recognize or draw fine distinctions.
14. An international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members.
15. A large number or amount.
17. Electronic equipment that provides visual images of varying electrical quantities.
18. A rotating disk shaped to convert circular into linear motion.
20. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
21. Strike with disgust or revulsion.
23. An officer who acts as military assistant to a more senior officer.
25. A unit of length of thread or yarn.
26. A collection of objects laid on top of each other.
29. A river in north central Switzerland that runs northeast into the Rhine.
31. A compartment in front of a motor vehicle where driver sits.
33. Mild yellow Dutch cheese made in balls.
37. English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984).
40. A public promotion of some product or service.
43. Charge against a citizen's person or property or activity for the support of government.
44. A doctor's degree in dental surgery.
47. A type of submachine gun that is designed and manufactured in Israel.
48. The executive agency that advises the President on the federal budget.
49. Kamarupan languages spoken in northeastern India and western Burma.
50. The 13th letter of the Hebrew alphabet.
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DOWN
1. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
2. Type genus of the Alcidae comprising solely the razorbill.
3. A state in east central United States.
4. A rechargeable battery with a nickel cathode and a cadmium anode.
5. A condensed but memorable saying embodying some important fact of experience that is taken as true by many people.
6. Having undesirable or negative qualities.
7. A state in northwestern North America.
8. A unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc.
9. Queen of the Olympian gods in ancient Greek mythology.
10. An organic compound that contains a hydroxyl group bonded to a carbon atom which in turn is doubly bonded to another carbon atom.
16. East Indian tree yielding a resin used medicinally and burned as incense.
19. A flat-bottomed volcanic crater that was formed by an explosion.
22. A prosthesis that replaces a missing leg.
24. A medicinal drug used to evoke vomiting (especially in cases of drug overdose or poisoning).
27. (Akkadian) God of wisdom.
28. A bluish-white lustrous metallic element.
30. The blood group whose red cells carry both the A and B antigens.
32. A radioactive element of the actinide series.
34. An item of factual information derived from measurement or research.
35. Affect with wonder.
36. A saying that widely accepted on its own merits.
38. Severe diabetes mellitus with an early onset.
39. Type genus of the family Arcidae.
41. An accountant certified by the state.
42. A graphical record of electrical activity of the brain.
45. A metallic element having four allotropic forms.
46. A silvery malleable metallic element that resists corrosion.
47. A brittle gray crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors.
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