I. ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: hour + glass
1. : an instrument for measuring time consisting of a glass vessel having two symmetrical compartments from the uppermost of which a quantity of sand, water, or mercury occupies an hour in running through a small aperture into the lower one and an hour returning when the instrument is turned upside down
2. : the space of time measured by an hourglass
[s]hourglas.jpg[/s]
II. adjective
: shaped like an hourglass
hourglass waistline
hourglass contraction of the stomach
hourglass tumor