| 1 | English | petechia | A small spot, especially on an organ, caused by... |
| 2 | Italian | petecchie | plural of petecchia; skin eruptions |
| 3 | Latin | petigo | a scab, an eruption |
| 4 | Latin | impetigo | impetigo |
| 5 | Latin | impeto | I rush upon, assail, attack |
| 6 | Latin | in- | un-, non-, not; in, within, inside |
| 7 | Latin | in | in, at, on, upon, from; within, while in; into,... |
| 8 | Old Latin | en | in |
| 9 | Proto-Italic | en | in |
| 10 | Proto-Indo-European | h₁én | in |