Dictionary
hour•glass
Pronunciation: (ouur'glas", -gläs", ou'ur-), [key]—
n.
an instrument for measuring time, consisting of two bulbs of glass joined by a narrow passage through which a quantity of sand or mercury runs in just an hour.
—
adj.
having a notably slim or narrow waist, midsection, or joining segment:
She has an hourglass figure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.