Definition of parkerizing in English:

parkerizing

(also parkerising)

noun

trademark in US
  • [mass noun] A process for rustproofing iron or steel by brief immersion in a hot acidic solution of a metal phosphate.

    • ‘Most have the nice blue finish instead of parkerizing, and good old fashioned walnut stocks, which my customers like.’
    • ‘Finish is a matte black powder coat over parkerizing.’

Origin

1920s: from Parker Rust-Proof Company of America (which introduced the process) + -ize + -ing.

Pronunciation:

parkerizing

/ˈpɑːkərʌɪzɪŋ/