1. Edible tuber of any of several yams.
4. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
8. Inquire about.
11. The compass point midway between east and southeast.
12. Amino acid that is formed in the liver and converted into dopamine in the brain.
13. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
14. Aromatic bulb used as seasoning.
15. Made of fir or pine.
16. Thigh of a hog (usually smoked).
17. A pilgrimage to Mecca.
19. Jordan's port.
21. American prizefighter who won the world heavyweight championship three times (born in 1942).
23. A light strong brittle gray toxic bivalent metallic element.
24. A high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus.
27. Lower in esteem.
31. (Old Testament) The second patriarch.
33. Type genus of the Alcidae comprising solely the razorbill.
34. A colorless odorless gaseous element that give a red glow in a vacuum tube.
35. The sign language used in the United States.
43. Lacking or deprive of the sense of hearing wholly or in part.
44. God of wealth and love.
45. A unit of pressure.
48. Electrical conduction through a gas in an applied electric field.
49. A light touch or stroke.
50. Type genus of the Anatidae.
51. The syllable naming the sixth (submediant) note of a major or minor scale in solmization.

1. Not only so, but.
2. The largest continent with 60% of the earth's population.
3. A form of rummy using two decks and four jokers.
4. Not divisible by two.
5. of or relating to poetry.
6. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
7. West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice.
8. Title for a civil or military leader (especially in Turkey).
9. Someone who works (or provides workers) during a strike.
10. God of love and erotic desire.
18. A string of more than 3,000 islands east of Asia extending 1,300 miles between the Sea of Japan and the western Pacific Ocean.
20. Cubes of meat marinated and cooked on a skewer usually with vegetables.
22. A cord that is drawn through eyelets or around hooks in order to draw together two edges (as of a shoe or garment).
25. A very poisonous metallic element that has three allotropic forms.
26. A white soft metallic element that tarnishes readily.
28. A silvery ductile metallic element found primarily in bauxite.
29. A white trivalent metallic element.
30. (Akkadian) God of wisdom.
32. (computer science) A coding system that incorporates extra parity bits in order to detect errors.
36. Stalk of a moss capsule.
37. Young sheep.
38. (Norse mythology) Ruler of the Aesir.
39. A bachelor's degree in library science.
40. Any of numerous local fertility and nature deities worshipped by ancient Semitic peoples.
41. A city in northern India.
42. Measuring instrument for indicating speed of rotation.
46. A soft silvery metallic element of the alkali earth group.
47. An intensely radioactive metallic element that occurs in minute amounts in uranium ores.
48. A loose sleeveless outer garment made from aba cloth.