1. A widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells.
4. An enclosed space.
7. Common Indian weaverbird.
11. A drug combination found in some over-the-counter headache remedies (Aspirin and Phenacetin and Caffeine).
12. One of the most common of the five major classes of immunoglobulins.
13. In bed.
14. Relating to or characteristic of or occurring on the sea or ships.
15. A coenzyme derived from the B vitamin nicotinic acid.
16. The basic unit of money in Western Samoa.
17. Cubes of meat marinated and cooked on a skewer usually with vegetables.
19. A federal agency established to coordinate programs aimed at reducing pollution and protecting the environment.
21. A unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions.
22. A compartment in front of a motor vehicle where driver sits.
25. Stout-bodied insect with large membranous wings.
29. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
30. Large burrowing rodent of South and Central America.
33. A state in New England.
34. An esoteric or occult matter that is traditionally secret.
38. A public promotion of some product or service.
40. A flat wing-shaped process or winglike part of an organism.
43. According to the Old Testament he was a pagan king of Israel and husband of Jezebel (9th century BC).
44. A metric unit of volume or capacity equal to 10 liters.
46. Type genus of the family Arcidae.
49. A type of submachine gun that is designed and manufactured in Israel.
50. The elementary stages of any subject (usually plural).
51. A heavy long-handled hammer used to drive stakes or wedges.
52. A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material.
53. An informal term for a father.
54. A French abbot.
55. A unit of surface area equal to 100 square meters.

1. Danish philologist whose work on Old Norse pioneered in the field of comparative linguistics (1787-1832).
2. A fencing sword similar to a foil but with a heavier blade.
3. Someone who works (or provides workers) during a strike.
4. In the Arabian Nights a hero who tells of the fantastic adventures he had in his voyages.
5. Title for a civil or military leader (especially in Turkey).
6. (of a young animal) Abandoned by its mother and raised by hand.
7. A Chadic language spoken south of Lake Chad.
8. A loose sleeveless outer garment made from aba cloth.
9. A loud utterance.
10. (Old Testament) In Judeo-Christian mythology.
18. Any of various spiny trees or shrubs of the genus Acacia.
20. A sliver-white metallic element of the platinum group that resembles platinum.
23. (Scotland) A small loaf or roll of soft bread.
24. A soft silvery metallic element of the alkali earth group.
26. The sciences concerned with gathering and manipulating and storing and retrieving and classifying recorded information.
27. An emotional response that has been acquired by conditioning.
28. A small cake leavened with yeast.
31. A radioactive element of the actinide series.
32. A white metallic element that burns with a brilliant light.
35. (Zoroastrianism) Title for benevolent deities.
36. A person afflicted with leprosy.
37. Dwell (archaic).
39. A Chadic language spoken south of Lake Chad.
40. A compartment in front of a motor vehicle where driver sits.
41. A Tibetan or Mongolian priest of Lamaism.
42. An Arabic speaking person who lives in Arabia or North Africa.
43. A sweetened beverage of diluted fruit juice.
45. A digital display that uses liquid crystal cells that change reflectivity in an applied electric field.
47. An awkward and inexperienced youth.
48. Fermented alcoholic beverage similar to but heavier than beer.
49. A hard gray lustrous metallic element that is highly corrosion-resistant.