1. Gone by.
4. Either of two spiral-horned antelopes of the African bush.
8. A Kwa language spoken by the Yoruba people in southwestern Nigeria.
11. Game in which matchsticks are arranged in rows and players alternately remove one or more of them.
12. The act of scanning.
13. A crystalline rock that can be cut and polished for jewelry.
14. By bad luck.
16. The elementary stages of any subject (usually plural).
17. A gradual decline (in size or strength or power or number).
18. The capital and largest city of Yemen.
20. 30 to 300 kilohertz.
22. A colorless and odorless inert gas.
23. The rate at which energy is drawn from a source that produces a flow of electricity in a circuit.
25. A public promotion of some product or service.
26. A soft silvery metallic element of the alkali earth group.
27. South American plant cultivated for its large fragrant trumpet-shaped flowers.
30. A metric unit of volume or capacity equal to 10 liters.
32. Title for a civil or military leader (especially in Turkey).
33. (computer science) A coding system that incorporates extra parity bits in order to detect errors.
35. A white linen liturgical vestment with sleeves.
38. (Akkadian) God of wisdom.
40. An official prosecutor for a judicial district.
44. Any of a number of fishes of the family Carangidae.
47. Tree of the West Indies and northern South America bearing succulent edible orange-sized fruit.
48. Related by blood.
49. A port in southwestern Scotland.
52. A compartment in front of a motor vehicle where driver sits.
53. In or of the month preceding the present one.
54. A flat-bottomed volcanic crater that was formed by an explosion.
55. A flat wing-shaped process or winglike part of an organism.

1. Type genus of the Anatidae.
2. A river that rises in western New Mexico and flows westward through southern Arizona to become a tributary of the Colorado River.
3. A strategically located monarchy on the southern and eastern coasts of the Arabian Peninsula.
4. A state in midwestern United States.
5. Fiddler crabs.
6. A light touch or stroke.
7. Having removed clothing.
8. How long something has existed.
9. Cubes of meat marinated and cooked on a skewer usually with vegetables.
10. A region of complete shadow resulting from total obstruction of light.
15. A branch of the Tai languages.
19. Naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion.
21. A federal agency established to regulate the release of new foods and health-related products.
24. The front of the head from the forehead to the chin and ear to ear.
28. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
29. A state in midwestern United States.
31. Resinlike substance secreted by certain lac insects.
34. Being one hundred more than three hundred.
36. A condition (mostly in boys) characterized by behavioral and learning disorders.
37. A loose sleeveless outer garment made from aba cloth.
39. Any group or radical of the form RCO- where R is an organic group.
40. An adult male person (as opposed to a woman).
41. Slightly open.
42. Consisting of or involving two parts or components usually in pairs.
43. A small cake leavened with yeast.
45. The products of human creativity.
46. Leaf or strip from a leaf of the talipot palm used in India for writing paper.
48. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
50. Before noon.
51. A white metallic element that burns with a brilliant light.
52. A boy or man.