1. Straightness or Correctness:
* Orthography: The correct way to spell words.
* Orthodontics: The branch of dentistry that deals with straightening teeth.
* Orthopedics: The branch of medicine that deals with correcting deformities of the musculoskeletal system.
* Orthogonal: Perpendicular or at right angles.
2. Position or Orientation:
* Orthostatic: Related to standing upright.
* Orthotopic: Located in the normal or correct position.
3. Other:
* Ortho-: A chemical prefix indicating a particular arrangement of atoms in a molecule.
In summary, "ortho" generally conveys a sense of straightness, correctness, or proper alignment.