English edit

 
A petrol blue evening gown by designer Sybil Connolly

Noun edit

petrol blue

  1. (British) A greyish blue colour, tinted with green.
    petrol blue:  

Usage notes edit

Many people erroneously believe that this is a misspelling of petrel blue, and that the term refers to the sea bird. However, the OED gives only this spelling. The term may originally have pertained to petrol-derived compounds such as paraffin, which is often coloured blue.

Adjective edit

petrol blue

  1. (British) Of a greyish blue colour, tinted with green.

See also edit