The line in a chromaticity diagram representing the chromaticity of full ( or planckian ) radiators of different temperatures 色度图上代表不同温度黑体（普朗克辐射体）的色度曲线。
2.
The temperature of the planckian radiator whose perceived color most closely resembles that of a given stimulus at the same brightness and under specified viewing conditions 在特定条件下，亮度相同时，普朗克辐射体的感官颜色与给定的刺激值最为接近，则此时普朗克辐射体的温度被定义为相关色温。
