Plural of arbor (a shaded garden shelter or framework supporting climbing plants); or the Latin plural of arbor meaning trees.
From Latin 'arbor' (tree), with '-es' as the standard Latin plural ending. In English, it often refers specifically to garden structures, but in scientific/academic contexts preserves the Latin meaning of multiple trees.
The word 'arbor' has beautiful redundancy—a garden arbor is literally a tree-like structure that you sit under while contemplating real trees, making it a poetic human attempt to recreate nature's shelter.
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