| 1 | English | respirate | To give artificial respiration to |
| 2 | English | respiration | The process of inhaling and exhaling; breathing,... |
| 3 | Middle English | respiracioun | — |
| 4 | Latin | respiratio | exhaling; breathing, respiration |
| 5 | Latin | respīrō | — |
| 6 | Latin | rĕ- | — |
| 7 | Latin | prōdūcō | — |
| 8 | Latin | prō- | — |
| 9 | Proto-Italic | *pro- | — |
| 10 | Proto-Indo-European | pro- | toward, forward |
| 11 | Proto-Indo-European | por- | to give birth; forward, through; going, passage |
| 12 | Proto-Indo-European | per- | before, in front; first; to go through |
| 13 | Proto-Indo-European | pr̥tós | passed , crossed |