mewer

One who makes a mewing sound; a cat.

They heard a noise of mournful mewing, and looked down at the cats in the river below. A small black one, the probable mewer, was gazing up at them with such a sorrowful expression in its green eyes that my lady was wrung with pity.

This supposedly demonstrates 'uncertainty' because one doesn't know if the cat is dead or alive until you peek inside. However, our version is more deterministic. There is no isotope-clock, no hydrocyanic acid. We drop a mewer in one of these reusable modules, close it tight, add just a limited supply of oxygen […]

One who mews (flattens the tongue against the roof of the mouth for supposed health benefits).