Definitions for "Blackbody"
Ideal body capable of absorbing all radiation falling on it and reemitting it without loss; the spectrum of blackbody radiation is a continuous one and is characterized by the absolute temperature of the blackbody; see Planck's law, Stefan-Boltzmann law, Wien's law, and thermal radiation.
object which absorbs all incident radiation and emits according to how hot it is.
an object that absorbs all radiation falling on it and radiates it perfectly.