brown dwarfbrown dwarf
nounpl. brown dwarfs or occas.brown dwarves
a celestial object consisting of a body of gas that gives off a small amount of radiation but lacks sufficient mass to initiate the nuclear fusion that characterizes true stars
A celestial body that is more massive than a gas giant planet but has insufficient mass to sustain the hydrogen fusion reactions that produce radiant energy in normal stars.
(plural brown dwarfs or brown dwarves)