the world > matter > colour > named colours > grey or greyness > [adjective] > iron or steel grey (5)
Of a dark grey colour; designating this colour. Also: (of a person) having dark grey hair.
Designating the dark grey colour of iron; of this colour. Also: of the colour of rust, designating such a colour.
With the sense ‘resembling steel’ (in colour, hardness, etc.), as steel gloss; steel-bright, steel-hard, steel-sharp, steel-straight, steel-strong…
Resembling steel in appearance, colour, hardness, or some other quality.
The name of a cold shade of grey resembling the colour of steel; steel-grey. Also as adj.