Covered with or consisting of grass and herbaceous vegetation; clothed in grass or herbs.
From 'herbage' (grass and plants) + '-ed' (adjective suffix meaning 'having'). 'Herbage' comes from Latin 'herba' (plant/grass) and has been used in English since medieval times for pasture vegetation.
Herbaged is a poetic, old-fashioned way to describe a field—it was common in literature to describe the 'herbaged slopes' of mountains or hillsides, painting a picture of lush green growth.
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