彩信 Traditional form: 彩信 Pinyin (reading): cǎixìn Definitions: multimedia messaging service (MMS) (telecommunications) Characters: 彩 - color, hue; prize; brilliant; variegated 信 - to trust, to believe; letter, sign Traditional characters: 彩 - color, hue; prize; brilliant; variegated 信 - to trust, to believe; letter, sign