noun sun·di·al \-ˌdī(-ə)l\

: a device that is used to show the time of day by the position of the sun and that consists of a plate with markings like a clock and an object with a straight edge that casts a shadow onto the plate

Full Definition of SUNDIAL

:  an instrument to show the time of day by the shadow of a gnomon on a usually horizontal plate or on a cylindrical surface

First Known Use of SUNDIAL



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