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Noun: iron blue  I(-u)rn bloo
  1. Slightly purplish or bluish dark grey
    - steel grey [Brit, Cdn], steel gray [US], Davy's grey [Brit, Cdn], Davy's gray [US]
  2. Any of various blue pigments
    - Prussian blue

Derived forms: iron blues

Type of: gray [US], grayness [US], grey [Brit, Cdn], greyness [Brit, Cdn], pigment