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Arboretum: An arboretum in a general sense is a botanical collection composed exclusively of trees. More commonly a modern arboretum is a botanical garden containing living collections of woody plants and is intended at least in part for scientific study.
Arbor Day: Arbor Day is a holiday in which individuals and groups are encouraged to plant trees. Today, many countries observe such a holiday.
Arboreal locomotion: Arboreal locomotion is the locomotion of animals in trees. In habitats in which trees are present, animals have evolved to move in them.
Arborist: An arborist, tree surgeon, or arboriculturist, is a professional in the practice of arboriculture, which is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants in dendrology and horticulture. Arborists generally focus on the health and safety of individual plants and trees, rather than managing forests (the domains of forestry and silviculture) or harvesting wood.