An Etymological Dictionary of Astronomy and Astrophysics

A device for measuring time; it consists of a glass container having two compartments from the uppermost of which a quantity of sand runs in an hour into the lower one through a narrow tube.

Etymology (EN): Hour glass, from → hour + → glass.

Etymology (PE): Sâat-e šeni, from sâat, → hour +
šeni, adj. of šen “sand.”