Physics. [f. Gr. ἀθέρμαντος not heated: see next.] Athermanous quality; the power of stopping radiant heat.
1863. Atkinson, Ganot’s Physics (1877), § 422. Athermancy … corresponds to opacity for light.
1870. Matt. Williams, Fuel of Sun, § 111. 77. The quantitative athermacy [sic] of flame.
