iron blue

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. slightly purplish or bluish dark grey
• Syn:
steel grey, steel gray, Davy's grey, Davy's gray
• Hypernyms:
gray, grayness, grey, greyness
2. any of various blue pigments
• Syn:
Prussian blue
• Hypernyms:
pigment