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porphyrization

American  
[pawr-fuh-ruh-zey-shuhn] / ˌpɔr fə rəˈzeɪ ʃən /

noun

  1. reduction to a powder, formerly done on a slab of porphyry.


Etymology

Origin of porphyrization

First recorded in 1825–35; porphyrize + -ation