The P to F Sound Shift in the Germanic Languages

The latin word for fish was piscus, which is the origin of the zodiac sign pises. We can see that same sound change in the latin word pyre, as in a funeral pyre. And in the word pyromania, the english equivalent is the word fire. So from pyre to fire, we can hear the p to f sound shift. Another interesting example of thissound change can be seen in the english word pen, as in the writing instrument p e n. The word comes to us via french from the original latin word panna. By the time norman french brought the word into english as pen, it had come to mean a