Opaqueness to radiant heat
• (n.) Inability to transmit radiant heat; impermeability to heat.
Impermeability to heat. ... Origin: G. Athermantos, not heated, fr. A-priv. + thermaino, to heat, fr. Therme, heat ... (05 Mar 2000) ... 
A·ther'man·cy (ȧ*thẽr'măn*sȳ) noun [ See Athermanous .] Inability to transmit radiant heat; impermeability to heat. Tyndall. 
Type: Term Pronunciation: ă-ther′man-sē Definitions: 1. Impermeability to heat.
athermancy 1. Impermeability to heat (no heat passing through). 2. The inability of a substance to transmit infrared radiation or radiant heat. Thermo Quiz #1 to check your thermo-word knowledge. Thermo Quiz #2 to check more of your thermo-word knowledge. Thermo Quiz #3 for additional the...