More full of beams; more characterized by beaming light or cheerful expression (comparative form).
From 'beamy' (adjective meaning 'full of beams' or 'radiating light') + '-er' (comparative suffix). Standard adjectival comparison.
When you describe someone's smile as 'beamier' than another person's, you're using an old English adjective that compares how brightly their face shines with happiness.
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