1. Hold machine parts together
4. Thailand
8. Evergreen trees and shrubs having oily one-seeded fruits
12. Put into service
13. South American Indian
14. Certificate
15. Swiftness
17. Supplemented with difficulty
18. Exchange for money
19. Merchandising
21. Complex quantities
23. Flows into Rhine
26. Portuguese folk song
29. Remedy
31. The length of time something (or someone) has existed
32. Airs
33. Taoism
34. Fried rolls
36. Sean __, actor
37. Debates
38. Thorny flower
40. Girl
42. Changeable
46. Pulses
48. Flatterer
50. A way to confine
51. Round flat Middle Eastern bread
52. Box, abbr.
53. Litigates
54. Plant origin
55. In a way, gets
2. A small island
3. Moulding
4. Obsequious use of title
5. Indicating hostility
6. Behave in a certain manner
7. Cans
8. Wildcat of Central and South America
9. The shore of a lake
10. Before
16. Medium-sized mackerel
20. Portuguese nurses
22. More inevitable
24. Welsh for John
25. Boxing champ
26. Agriculture center
27. Charge
28. Make lonely
30. Fixed in one's purpose
35. Conditions of balance
36. Having nine hinged bands of bony plates
39. Dish of greens
41. Drains
43. Scratch
44. Fish genus
45. Sea eagles
46. Public broadcaster
47. Cologne
49. Regular hexahedron