| PTO | of or relating to the geocentric Ptolemaic system |
|---|---|
| PTO | of or relating to the astronomer Ptolemy |
| PTO | Ptolemy's model of the universe with the Earth at the center |
| PTO | Alexandrian astronomer who proposed a geocentric system of astronomy that was undisputed until Copernicus (2nd century AD) |
| PTO | any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria |
| PTO | a term for food poisoning that is no longer in scientific use |
| PTO | any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria |
| PTO | a term for food poisoning that is no longer in scientific use |
| PTO | drooping of the upper eyelid caused by muscle paralysis and weakness |