1. Payment due by the recipient on delivery.
4. Not only so, but.
8. A federal agency established to regulate the release of new foods and health-related products.
11. An edge tool with a heavy bladed head mounted across a handle.
12. Predatory black-and-white toothed whale with large dorsal fin.
13. The sense organ for hearing and equilibrium.
14. Large swift fly the female of which sucks blood of various animals.
15. Botswanan statesman who was the first president of Botswana (1921-1980).
16. Relating to or characteristic of or occurring in the air.
17. (usually followed by `to') Having the necessary means or skill or know-how or authority to do something.
20. The most common computer memory which can be used by programs to perform necessary tasks while the computer is on.
21. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
23. According to the Old Testament he was a pagan king of Israel and husband of Jezebel (9th century BC).
25. A compartment in front of a motor vehicle where driver sits.
27. A soft heavy toxic malleable metallic element.
30. Antibacterial drug (trade name Nydrazid) used to treat tuberculosis.
32. A coffee cake flavored with orange rind and raisins and almonds.
34. A soft silvery metallic element of the alkali earth group.
35. Title for a civil or military leader (especially in Turkey).
37. The branch of engineering science that studies the uses of electricity and the equipment for power generation and distribution and the control of machines and communication.
38. A Chadic language spoken south of Lake Chad.
44. Angular distance above the horizon (especially of a celestial object).
48. (informal) Of the highest quality.
49. A light touch or stroke.
50. 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.
51. A boy or man.
52. The act of slowing down or falling behind.
53. A signal transmitted along a narrow path.

1. Tropical American tree producing cacao beans.
2. Eurasian primrose with yellow flowers clustered in a one-sided umbel.
3. United States industrialist who manufactured plows suitable for working the prairie soil (1804-1886).
4. A Hindu theistic philosophy.
5. A trivalent metallic element of the rare earth group.
6. A radioactive element of the actinide series.
7. Australian shrubs and small trees with evergreen usually spiny leaves and dense clusters of showy flowers.
8. An emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight).
9. Fallow deer.
10. The biblical name for ancient Syria.
18. A small cake leavened with yeast.
19. A gonadotropic hormone that is secreted by the anterior pituitary.
22. Being ten more than one hundred ninety.
24. (Scottish) Bluish-black or gray-blue.
26. A loose sleeveless outer garment made from aba cloth.
28. The blood group whose red cells carry both the A and B antigens.
29. An official prosecutor for a judicial district.
31. Wearing a hat or a hat of a particular kind.
33. Large brownish-green New Zealand parrot.
36. A rare silvery (usually trivalent) metallic element.
39. Type genus of the Alcidae comprising solely the razorbill.
40. 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.
41. (Scotland) A slope or hillside.
42. Common Indian weaverbird.
43. Winning all or all but one of the tricks in bridge.
45. A unit of force equal to the force that imparts an acceleration of 1 foot/sec/sec to a mass of 1 pound.
46. A plant hormone promoting elongation of stems and roots.
47. The executive agency that advises the President on the federal budget.
48. A colorless and odorless inert gas.