1. （色彩）淡的，柔和的
Pastel colours are pale rather than dark or bright.

2. 彩色粉笔
Pastels are also small sticks of different coloured chalks that are used for drawing pictures.

3. 彩色粉笔画；彩粉画
A pastel is a picture that has been done using pastels.

1. any of various pale or light colors