| 1 | Ancient Greek | ὀρίγανον | oregano, marjoram; sourness, bitterness |
| 2 | Ancient Greek | ὄρος | a mountain, hill; mountain chain; district,... |
| 3 | Ancient Greek | ὄρνυμι | to set upon, let loose upon, move on; to awaken,... |
| 4 | Proto-Indo-European | h₃er- | to move, to stir; to rise, to spring; to quarrel,... |