Having a glimmering quality; shining faintly or intermittently with a soft, wavering light.
From glimmer plus the adjectival suffix -ous (meaning 'full of' or 'having the quality of'). Similar to how dangerous comes from danger, glimmerous means 'full of glimmering.'
This archaic adjective shows how English loves layering descriptive suffixes—'glimmerous' doesn't just mean 'glimmers,' but conveys the permanent quality or essence of glimmering, like calling someone 'generous' rather than 'gives generously.'
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