Meaning of pressure-treated

pres•sure-treat•ed

Pronunciation: (presh'ur-trē"tid), [key]
— adj.
  1. (of wood) treated with a chemical or chemicals applied under pressure to reduce such problems as insect infestation, decay, and rotting.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.