v. tPaynizeTo treat or preserve, as wood, by a process resembling kyanizing.
Century Dictionary and Cyclopedia
paynizeTo harden and preserve, as wood, by a process consisting in placing the material to be treated in a close chamber, depriving it of its air by means of an air-pump, and then injecting a solution of sulphid of calcium or of barium, following this with a solution of sulphate of lime. The latter salt acts chemically on the calcium or barium sulphid, forming all through the wood sulphate of calcium (gypsum) or sulphate of barium (heavy-spar). Wood thus treated is very heavy, but very durable and nearly incombustible.