Green vegetation or the state of being covered with green plants; lush greenery.
From Old French 'enverdure' combining 'en-' (to make) and 'verdure' (greenness, vegetation) from Latin 'viridis' (green). Used from medieval to early modern times to describe pastoral landscapes.
This lovely word almost disappeared from English, surviving mainly in poetry and very old texts—it's the kind of descriptive term Romantic poets loved for painting scenes of nature.
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