1. Autograph (auto-): Self-written signature.
  2. Biography (bio-): The story of someone’s life.
  3. Telephone (tele-): Device to talk over long distances.
  4. Photograph (photo-): Picture taken with a camera.
  5. Microscope (micro-): Tool to see tiny objects.
  6. Television (tele-): Device for seeing and hearing distant events.
  7. Bicycle (bi-): Vehicle with two wheels.
  8. Unicorn (uni-): Mythical horse with one horn.
  9. Geography (geo-): Study of the Earth’s surface.
  10. Hydrant (hydro-): Pipe used to control water.
  11. Thermometer (thermo-): Tool to measure temperature.
  12. Aquarium (aqua-): Tank for keeping fish and water plants.
  13. Periscope (peri-): Device to see from above or around.
  14. Hyperactive (hyper-): Overly active.
  15. Root (radic-): Part of a plant that grows underground.
  16. Spectacle (spect-): Glasses or something impressive to see.
  17. Submarine (sub-): Ship that can go underwater.
  18. Omnivore (omni-): Animal that eats all kinds of food.
  19. Scribe (scrib-): Person who writes or copies documents.
  20. Portable (port-): Easy to carry.
  21. Cycle (cycl-): A series of events that repeat in the same order.
  22. Astronomy (astro-): Study of stars and planets.
  23. Postscript (post-): Note added at the end of a letter.
  24. Invisible (in-): Not able to be seen.
  25. Microwave (micro-): A small wave used for cooking food.
  26. Dictionary (dict-): Book that defines words.
  27. Decade (deca-): A period of ten years.
  28. Mathematics (math-): Study of numbers and shapes.
  29. Museum (muse-): Place where important objects are displayed.
  30. Interview (inter-): Meeting to ask questions.
  31. Helicopter (helix-): Aircraft with rotating blades.
  32. Ecosystem (eco-): Community of living things and their environment.
  33. Autonomy (auto-): Self-governance or independence.
  34. Pseudonym (pseudo-): Fake name used by authors.
  35. Aquatic (aqua-): Related to water.
  36. Biography (bio-): Life story of a person.
  37. Symphony (sym-): Long piece of music for an orchestra.
  38. Geology (geo-): Study of Earth’s structure.
  39. Celsius (cel-): Temperature scale.
  40. Dental (dent-): Related to teeth.
  41. Journal (journ-): Book or newspaper where events are recorded.
  42. Dynamo (dynam-): Machine that generates power.
  43. Epicenter (epi-): Point on the Earth’s surface directly above an earthquake’s origin.
  44. Temperature (temp-): Measure of heat.
  45. Microscope (micro-): Tool to view very small objects.
  46. Neon (neo-): A type of gas used in bright lights.
  47. Triangle (tri-): Shape with three sides.
  48. Vision (vis-): Ability to see.
  49. Mono (mon-): One or single.
  50. Photo (photo-): Light or picture.
  51. Planetarium (planet-): Place to watch the stars and planets.
  52. Chronic (chron-): Long-lasting or constant.
  53. Paleo (paleo-): Ancient or old.
  54. Phobia (phob-): Fear of something.
  55. Telegraph (tele-): Early device for sending messages over long distances.
  56. Marine (mar-): Related to the sea.
  57. Revise (re-): To look at again or change.
  58. Geothermal (geo-): Heat from the Earth.
  59. Photocopy (photo-): Copy made with light.
  60. Hyperbole (hyper-): Exaggerated statement.
  61. Synthesis (syn-): Combining parts to make a whole.
  62. Biology (bio-): Study of living organisms.
  63. Subway (sub-): Underground railway system.
  64. Audio (audi-): Related to sound.
  65. Transfer (trans-): Move from one place to another.
  66. Polygamy (poly-): Having more than one spouse.
  67. Magnify (magn-): Make something appear larger.
  68. Manual (manu-): Done by hand.
  69. Amiable (ami-): Friendly or pleasant.
  70. Reactor (react-): Device where nuclear reactions occur.
  71. Dendrology (dendro-): Study of trees.
  72. Encyclopedia (cyclo-): Book containing a wide range of knowledge.
  73. Semi-circle (semi-): Half of a circle.
  74. Automobile (auto-): Self-moving vehicle.
  75. Underwater (under-): Beneath the surface of the water.
  76. Articulate (articul-): Express ideas clearly.
  77. Dual (du-): Twofold or double.
  78. Hypothesis (hypo-): An educated guess or theory.
  79. Quadrant (quad-): One-fourth of a circle.
  80. Lunar (luna-): Related to the moon.
  81. Calendar (calend-): System for organizing days.
  82. Renaissance (re-): Revival or rebirth of art and learning.
  83. Multicolor (multi-): Having many colors.
  84. Suffix (fix-): Letters added at the end of a word.
  85. Contradict (contra-): To say the opposite of.
  86. Motorcycle (motor-): Two-wheeled vehicle powered by an engine.
  87. Hospital (hospit-): Place where sick people are treated.
  88. Permanent (per-): Lasting forever or a long time.
  89. Symmetry (sym-): Balanced proportions.
  90. Decipher (de-): To make sense of something difficult to understand.
  91. Astronaut (astro-): Person trained to travel in space.
  92. Translate (trans-): To change words from one language to another.
  93. Archaeology (archaeo-): Study of ancient human history.
  94. Nucleus (nucle-): Central part of a cell or atom.
  95. Carnivore (carn-): Animal that eats meat.
  96. Tricolor (tri-): Having three colors.
  97. Oxygen (oxy-): Gas essential for breathing.
  98. Pseudoscience (pseudo-): False or misleading science.
  99. Omit (omit-): To leave out or exclude.
  100. Hologram (holo-): Three-dimensional image created with light.