ˈhēlēəˌstat noun
( -s )
Etymology: New Latin heliostata, from heli- (I) + -stata (from Greek -statēs -stat)
1. : an instrument consisting of a mirror mounted on an axis moved by clockwork by which a sunbeam is steadily reflected in one direction — compare coelostat
2. : a geodetic heliotrope
• he·li·o·stat·ic |hēlēə|stad.ik adjective