(management) The theory that people in an organization tend to rise (be promoted) to the level of their incompetence.

petroleum ether

petroleum ether / plural of petroleum spirit

A volatile petroleum fraction, usually available in a number of fractions boiling between 40°C and 140°C. Used as a solvent in the laboratory and industry.

(military) A petroleum product (generally a lubricant, oil, grease, or specialty item) normally packaged by a manufacturer and procured, stored, transported, and issued in containers having a fill capacity of 55 United States gallons (or 45 imperial gallons, or 205 liters) or less.

plural of petty officer

plural of petroleum jelly

plural of packaged petroleum product

Alternative spelling of diving petrel

Any seabird of the family Pelecanoididae in the order Procellariiformes, resembling auks and native to the southern oceans.