diaˈthermacy
[ad. F. diathermasie (Melloni, 1841), ad. Gr. διαθερµασία a warming through, f. διά through + θερµασία heat. This Eng. form, which would regularly have been diathermasy, is conformed to words in -acy.]
The quality of being diathermic; = diathermancy 2.
| 1867 W. A. Miller Elem. Chem. i. (ed. 4) 296 Scarcely superior to pure water in diathermacy. 1870 Matt. Williams Fuel of Sun §113 Any degree of diathermacy permitting radiation to take place..across the flame. 1877 [see diathermic a. 1]. |