Originally U.S. Of a commodity, service, etc.: superior in quality and therefore commanding a higher price. Of a price: suited to an item of…

having, displaying, bearing as insignia, or being designated by three stars as a mark of quality, rank, etc., usually in a four- or five-star…

Of the nature of or resembling naphtha.

Of, relating to, or suggestive of paraffin; covered or smeared with paraffin; smelling of paraffin.

That propels (in various senses); capable of driving, pushing, or moving something in a particular direction; now spec. (of an explosive, etc.)…

(a) adj.tending to cause knocking when present in the fuel used in an internal combustion engine; (b) n.a substance having this property.

Designating motor or aviation fuel with a high octane number.

= high-octane, adj. 1.

Of petrol or other fuel: without added lead.

Employing a monopropellant; of the nature of a monopropellant.

Of petrol: = unleaded, adj. 1b.

Designating or relating to fuel of this grade.