Arbor day

a day, varying in date but always in the spring, observed in certain states of the U.S. by the planting of trees.

the day set aside for the planting of trees, first celebrated 1872 in Nebraska, the brainchild of U.S. agriculturalist and journalist J. Sterling Morton (1832-1902). From Latin arbor “tree,” of unknown origin.


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  • Arbor vitae

    a treelike appearance in a vertical section of the cerebellum, due to the arrangement of the white and gray nerve tissues. Historical Examples It is easy to remember that lignum vitae is one of the hardest woods and arbor vitae one of the softest. Outdoor Sports and Games Claude H. Miller I am going into […]

  • Arborvitae

    any of several ornamental or timber-producing evergreen trees belonging to the genus Thuja, of the cypress family, native to North America and eastern Asia, having a scaly bark and scalelike leaves on branchlets. Anatomy, .

  • Arboraceous

    adjective (literary) resembling a tree wooded

  • Arboreal

    of or relating to trees; treelike. Also, arboreous. living in or among trees. Zoology. adapted for living and moving about in trees, as the limbs and skeleton of opossums, squirrels, monkeys, and apes. Historical Examples But such a conception leaves unexplained the great differences between monkeys and gibbons in arboreal and terrestrial activity. The Outline […]

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