athermancy

Etymology
See.

Noun

 * 1) Inability to transmit radiant heat; impermeability to heat.
 * 2) * 1862,, "Further Researches on the Absorption and Radiation of Heat by Gaseous Matter", , in Contributions to Molecular Physics in the Domain of Radiant Heat (1893), page 106
 * In fact the very experiments devised to show conductivity proved in a very striking manner the existence of athermancy, or opacity to radiant heat, in the case of a considerable number of gases.