xenosphere

plural xenospheres

1. A spheroid culture from a xenograft.
2. A particulate remnant of carbon released in the combustion of oil or coal.

   In the region of the spray cone rather large vaporizing or burning oil droplets up to 100 rim, or their residuals like xenospheres, will be found.

   1988, Ronald J. Adrian, Laser Anemometry in Fluid Mechanics III

   1 more example

   There is good evidence that with burning oil sprays the larger droplets may crack to carbon, sometimes forming xenospheres which pass through the flame front.

   1970, Alfred Gordon Gaydon, Flames; their structure, radiation and temperature, page 204