Lewis Short
mĕtŏpa (noun F) = μετόπη:
* The space between two hollows; in architecture, the space between two dentils or two triglyphs, a metope (only in Vitr.): inter denticulos et inter triglyphos quae sunt intervalla, metopae nominantur, etc.,Vitr. 4, 2, 4.
Charlton T. Lewis, Charles Short, A Latin Dictionary