1. Any of various trees of the genus Ulmus.
4. Tropical woody herb with showy yellow flowers and flat pods.
8. (informal) Of the highest quality.
11. A doctor's degree in education.
12. Type genus of the Alcidae comprising solely the razorbill.
13. A city in northwestern Iran.
14. A barrier constructed to contain the flow or water or to keep out the sea.
15. Medium-sized tree having glossy lanceolate leaves.
16. Electrical conduction through a gas in an applied electric field.
17. Jordan's port.
19. A telegram sent abroad.
21. English writer and a central member of the Fabian Society (1858-1943).
24. The British system of withholding tax.
25. A young woman making her debut into society.
28. A river in north central Switzerland that runs northeast into the Rhine.
29. A Chadic language spoken south of Lake Chad.
31. Nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate.
34. A gonadotropic hormone that is secreted by the anterior pituitary.
35. Title for a civil or military leader (especially in Turkey).
36. A radioactive element of the actinide series.
38. A public promotion of some product or service.
39. The protoplasm of the germ cells that contains chromosomes and genes.
42. Divulge information or secrets.
46. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
47. The sense organ for hearing and equilibrium.
49. United States liquid unit equal to 4 quarts or 3.785 liters.
50. A nucleic acid consisting of large molecules shaped like a double helix.
51. The act of scanning.
52. A loose sleeveless outer garment made from aba cloth.

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. Fairly small terrestrial ferns of tropical America.
5. A flat wing-shaped process or winglike part of an organism.
6. Hormone produced early in pregnancy by the placenta.
7. Concerning those not members of the clergy.
8. Jordan's port.
9. (of hair) Having curls or waves.
10. A person who acts as host at formal occasions (makes an introductory speech and introduces other speakers).
18. The use of bacteria or viruses of toxins to destroy men and animals or food.
20. Any of various primates with short tails or no tail at all.
22. A small cake leavened with yeast.
23. (informal) Exceptionally good.
26. (Akkadian) God of wisdom.
27. Any of various units of capacity.
30. According to the Old Testament he was a pagan king of Israel and husband of Jezebel (9th century BC).
32. United States abolitionist (1786-1865).
33. A Bantu language spoken by the Chaga people in northern Tanzania.
37. Group of people related by blood or marriage.
40. Someone who works (or provides workers) during a strike.
41. The arch of bone beneath the eye that forms the prominence of the cheek.
43. A constellation in the southern hemisphere near Telescopium and Norma.
44. Committee formed by a special-interest group to raise money for their favorite political candidates.
45. The 7th letter of the Greek alphabet.
46. Being nine more than ninety.
48. A bachelor's degree in science.