Glowing with happiness, health, or love in a way that is clearly visible to others. It describes joy that shines outward and affects one's entire appearance.
From Latin 'radiare' meaning 'to emit rays' or 'shine forth'. The word connects the metaphor of light emission with the visible effects of intense positive emotions on facial expression and posture.
Radiant happiness literally changes our facial muscle patterns and posture in ways that make us appear to 'glow'! The increased blood flow and relaxed facial muscles create the luminous quality we associate with true joy.
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