secondary colour
noun [ C ] art UK specialized (US secondary color) uk/ˌsek.ən.dri ˈkʌl.ər/ us/ˌsek.ən.der.i ˈkʌl.ɚ/
二次色（可用两种原色合成的三种颜色，包括橙色、绿色和紫色）
one of the three colours – orange, green, or purple – that can be made by mixing together two of the primary colours