(Also with hyphen) rare. [f. TREE sb., after manhood, etc.] The state of a (full-grown) tree.

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1847.  H. Miller, First Impr., ix. 154. The saplings … have expanded into the dignity of full-grown treehood. Ibid., xvi. 292. Solid mid-aged treehood.

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1853.  Southern Standard, 16 April, 2/4. Until I [a poplar tree] had reached the meridian of tree-hood, no whiteman’s foot ever pressed the mossy sod, at my roots, or awakened by the sound of his axe, the repose of the surrounding forest.

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1904.  Carrie Shaw Rice, Song of Arbor Day, iii., in Where the Rhododendrons Grow.

        May they grow to stately treehood,
    By generations blest,
Amid their budding branches
    May the birdlings find a nest.

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