black oxide

English

Noun

black oxide (countable and uncountable, plural black oxides)

  2. (idiomatic) Any of several coatings for steels or copper; some are oxides (mainly iron(II,III) oxide), some are nitrites or nitrates, and some are selenides; all are black; the main purposes are the antireflective and cosmetic effects; the anticorrosion effects are small.
    Hypernyms: coating, finish; substance, material
    Coordinate terms: bluing, browning, phosphating, passivation, plating, electroplating, galvanizing
    Near-synonym: blackening
    hot black oxide;   cold black oxide
  4. Used other than figuratively or idiomatically: any oxide that is black; often, iron(II,III) oxide.
    Hypernyms: oxide < compound, substance, material

See also

  • magnetite (a mineral that is chemically equivalent to some kinds of black oxide)
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