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porphyrization

[pawr-fuh-ruh-zey-shuh n]
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noun
  1. reduction to a powder, formerly done on a slab of porphyry.
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Origin of porphyrization

First recorded in 1825–35; porphyrize + -ation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018