Words That Start with OS: A Complete List

Discover a comprehensive list of words that start with “os” to expand your vocabulary and impress your friends.

  1. Oscillate- to move or swing back and forth.
  2. Oscilloscope- a device for observing changing electrical signals.
  3. Ostensible- appearing to be true but not necessarily so.
  4. Ostentatious- designed to impress or attract notice.
  5. Ossify- to turn into bone.
  6. Osteoarthritis- a type of arthritis that occurs when flexible tissue at the ends of bones wears down.
  7. Osteoblast- a cell responsible for bone formation.
  8. Osteoclast- a large cell that absorbs bone tissue during growth and healing.
  9. Osteocyte- a bone cell, formed when an osteoblast becomes embedded in the matrix it has secreted.
  10. Osteology- the study of the structure and function of the skeleton and bony structures.
  11. Osteomalacia- softening of the bones, typically through a deficiency of vitamin D or calcium.
  12. Osteomyelitis- inflammation of bone or bone marrow, usually due to infection.
  13. Osteopathy- a type of alternative medicine that emphasizes physical manipulation of muscle tissue and bones.
  14. Osteoporosis- a medical condition in which the bones become brittle and fragile from loss of tissue.
  15. Ossuary- a container or room in which the bones of dead people are placed.
  16. Ostium- a small opening or orifice.
  17. Osseous- consisting of or turned into bone.
  18. Ossicle- a small bone, especially one of those in the middle ear.
  19. Osmosis- a process by which molecules of a solvent pass through a semipermeable membrane.
  20. Osmolarity- the concentration of a solution expressed as the total number of solute particles per liter.
  21. Osmoregulation- the maintenance of constant osmotic pressure in the fluids of an organism by the control of water and salt concentrations.
  22. Ostler (also Hostler)- a man employed to look after the horses of people staying at an inn.
  23. Osmeterium- a glandular, forked structure found on the first thoracic segment of caterpillars.
  24. Osmium- a chemical element with symbol Os and atomic number 76.
  25. Ossein- the collagen of bones, especially in gelatin.
  26. Osseointegration- the process by which a bone bonds to the surface of an implant.
  27. Osier- a small willow tree that grows mostly in cold places.
  28. Osmometer- an instrument for measuring osmotic pressure.
  29. Oscine- relating to songbirds or perching birds.
  30. Oscheal- relating to the scrotum.

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