The word "容光焕发" is formed by combining the two-character phrase "容光", meaning facial appearance or countenance with light, and "焕发", meaning to shine or radiate. Here, "容" denotes countenance, "光" denotes light, "焕" denotes glowing, and "发" denotes emitting. Together, they create a literal sense of "face glowing with light", used to describe someone whose appearance radiates health and vitality.