1. meniscus
2. biconcave
3. concavo-convex
4. convexo-concave
5. gouge
6. meniscoid
7. bowl
8. cove
9. pocket
10. scoop
11. amphicoelous
12. cavetto
13. concavo-concave
14. cymbal
15. basin
16. cassegrainian telescope
17. cup
18. depression
19. dish
20. engrailed
21. fillet
22. impression
23. imprint
24. indentation
25. indenture
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26. pendentive
27. pit
28. reentering polygon
29. reentrant polygon
30. scotia
31. solar furnace
32. trough
33. barchan
34. billhook
35. bowl-shaped
36. bruiser
37. centre of curvature
38. cissoid
39. clovis point
40. concavation
41. concavely
42. concaveness
43. concavous
44. conchoidal
45. cong
46. conge
47. corner
48. cupola
49. dishing
50. dome
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51. fossa
52. gorge
53. gullet
54. insides
55. niche
56. planoconcave
57. radio telescope
58. recess
59. recession
60. shell
61. socket
62. solar collector
63. solar dish
64. subconcave
65. subumbrella
66. vaulty
67. concavity
68. hollow
69. cyma
70. flute
71. acetabulum
72. castanets
73. concaved
74. concaving
75. convex
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76. crescent
77. focus
78. inflection
79. pantile
80. reflecting telescope
81. saddle-backed
82. vessel
83. aberrate
84. baffy
85. ball valve
86. baluster
87. band shell
88. beading plane
89. blade
90. cabriole
91. camera obscura
92. cassegrain antenna
93. castanet
94. circle of curvature
95. circular plane
96. clinocephalism
97. clinocephaly
98. collimated
99. compass plane
100. concave lens
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