Definition of "ortho" in Englisch

noun

1. (countable, chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.

2. (countable, astronomy) A certain type of flat eyepiece.

3. (countable, photography, dated) An orthochromatic plate.

4. (countable, linguistics) Clipping of orthography.

5. (countable, photography) Clipping of orthophoto.

6. (uncountable, medicine) Clipping of orthopedics.