/oweur"glas', -glahs', ow"euhr-/ , n.
1. 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.
2. having a notably slim or narrow waist, midsection, or joining segment: She has an hourglass figure.
[ 1505-15; HOUR + GLASS ]