| 1 | English | prop- | Denoting the presence of 3 carbon atoms in the... |
| 2 | English | propionic acid | The compound with the formula CHCHCOOH, a... |
| 3 | French | acide propionique | — |
| 4 | Ancient Greek | πρῶτος | first; earliest; foremost, most prominent |
| 5 | Ancient Greek | πρό | before; before, in front, forth, forward; before,... |
| 6 | Proto-Indo-European | pró | toward, leading to |
| 7 | Proto-Indo-European | per- | before, in front; first; to go through |
| 8 | Proto-Indo-European | pr̥tós | passed , crossed |