petr-

There was Petr Miller, a forgeman from the Prague ČKD plant.

In fact, the ancient definition was "Concha petr adhrens," and would apply to any shells attached to rocks.

If you ever show yourself in my cottage again, or even under the windows, look out, Petr!

Petr stood petrified, without moving from the spot, when the innocent child lisped out Pidrkas words to him.

See here, Petr: a beauty will stand before you in a moment; do whatever she commands; if notyou are lost for ever.

Petr doubted his senses, and stood thoughtfully before them, with both hands upon his sides.