Sundial (noun)

1. An instrument that tells the time of day by the position of the sun.
2. A device consisting of a flat plate, usually a disk or a flat, vertical gnomon with hour lines, that casts a shadow on a scale to indicate the time.

Origin:

From the latin word 'solis dialis', meaning 'dial of the sun'.

Examples:

1. My grandfather used to have a beautiful sundial in his garden.
2. In ancient times, the sundial was the most common timekeeping device.
3. The sundial on the old church has been damaged over the years.
4. The gnomon of the sundial was damaged by strong winds.
5. He always used the sundial to set his watch by.