Round flat plate (4)
I believe the answer is:
disc
(Other definitions for disc that I've seen before include "Flat thin circular body" , "In Olympic event" , "'Round, flat shape (4)'" , "counter" , "Spine cartilage layer" .)
I believe the answer is:
disc
(Other definitions for disc that I've seen before include "Flat thin circular body" , "In Olympic event" , "'Round, flat shape (4)'" , "counter" , "Spine cartilage layer" .)