The Collaborative International Dictionary
Isochronon
Isochronon \I*soch"ro*non\, n. [NL. See Isochronous.] A clock that is designed to keep very accurate time.
Wiktionary
isochronon
n. A clock designed to keep very accurate time.
Usage examples of "isochronon".
I'm told that the Autarch—whose health is the happiness of his subjects—has an isochronon in his sleeping chamber, a gift from another autarch from beyond the edge of the world.