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pressure-treated

[presh-er-tree-tid]
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adjective
  1. (of wood) treated with a chemical or chemicals applied under pressure to reduce such problems as insect infestation, decay, and rotting.
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Origin of pressure-treated

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018