Sub-brown dwarf

Definitions

(Noun) A free-floating object with a mass below the limiting mass for thermonuclear fusion of deuterium and equal to those of planets.

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(Noun) A free-floating object with a mass below the limiting mass for thermonuclear fusion of deuterium and equal to those of planets. More generally, an object with the mass of a planet that is not a satellite of another object, though it may be in mutual orbit with another object.